知识专题之估算策略-4
估算贯穿于基础数学学习的各个阶段，是一种数学策略，和计算相关联的以及和实际生活相关联的都需要估算，本质说现实世界得到的测量数据都是估算的近似的，没有绝对的精确。比如志强的身高是1.8m，他的体重是40Kg,这些都是一种近似的结果，用到了估算策略。所以估算是一种重要的数学能力之一，可以在实际中起到既方便又实用的目的。
估算策略：有四舍五入法；进一法；部分求整体法；凑整法等，目的都是为了简洁而快速的计算，重要的是体会估算策略的思想。
加减法：
987-651= 783-154= 350-341=
估算：_____ 估算：_____ 估算：_____
计算：_____ 计算：_____ 计算：_____
458+367= 154+902= 421+654=
估算：_____ 估算：_____ 估算：_____
计算：_____ 计算：_____ 计算：_____
乘除法：
1.包装一个小礼盒需要31厘米的彩带，现有320个这样的小礼盒，估一估，准备90米的彩带够吗？
2.不用计算，判断对错：
58×18=4534 （ ） 88×34=318 （ ）
150×40=600 （ ） 350×70=2450（ ）
声明: 本文采用 BY-NC-SA 协议进行授权. 转载请注明转自: 知识专题之估算策略-4
已有109 条评论回复文章： "知识专题之估算策略-4"
thank you admin
Buy it now.
Whoah this blog is excellent i really like reading your posts. Keep up the great paintings! You already know, many persons are hunting round for this info, you can aid them greatly.
There is perceptibly a lot to identify about this. I believe you made various good points in features also.
This will be the proper weblog for anybody who hopes to find out about this topic. You recognize a great deal its nearly challenging to argue with you (not too I just would want…HaHa). You certainly put a fresh spin using a topic thats been revealed for a long time. Wonderful stuff, just wonderful!
I simply want to tell you that I’m newbie to blogging and site-building and certainly enjoyed you’re web site. Probably I’m want to bookmark your blog post . You surely have outstanding writings. Thank you for sharing your blog.
There are some interesting points in time in this article but I don’t know if I see all of them center to heart. There is some validity but I will take hold opinion until I look into it further. Good article , thanks and we want more! Added to FeedBurner as well…
I discovered your weblog website on google and examine just a few of your early posts. Continue to keep up the very good operate. I simply further up your RSS feed to my MSN Information Reader. In search of forward to studying extra from you afterward!…
very nice post, i undoubtedly enjoy this amazing site, carry on it
My spouse and I absolutely love your blog and find nearly all of your post’s to be precisely what I’m looking for. Would you offer guest writers to write content for you? I wouldn’t mind producing a post or elaborating on a few of the subjects you write about here. Again, awesome site!
Spot i’ll carry on with this write-up, I must say i believe this web site needs considerably more consideration. I’ll more likely again to learn considerably more, many thanks that info.
i use both gold and silver bracelets because for me, they are both great bracelets to wear**
I discovered your site site on google and check many of your early posts. Preserve inside the really good operate. I extra the RSS feed to my MSN News Reader. Seeking toward reading far more within you at a later time!…
F*ckin’ awesome things here. I’m really glad to see your post. Thanks a whole lot and i am looking forward to contact you. Will you please drop me a e-mail?
You are in reality a just right webmaster. The website loading pace is incredible. It sort of feels that you know what you’re doing. Moreover the content is masterwork. You are done a magnificent process in this subject!
It’s truly a great and useful piece of info. I am glad that you simply shared this helpful info with us. Please stay us informed like this. Thank you for sharing.
Hi there, just became aware of your blog through Google, and found that it is really informative. I’m gonna watch out for brussels. I’ll appreciate if you continue this in future. Lots of people will be benefited from your writing. Cheers!
Thanks for sharing such a fastidious thinking, article is pleasant, thats why i have read it fully
I have been absent for a while, but now I remember why I used to love this web site. Thank you, I’ll try and check back more often. How frequently you update your site?
Hey are using WordPress for your blog platform? I’m new to the blog world but I’m trying to get started and create my own. Do you require any html coding expertise to make your own blog? Any help would be greatly appreciated!
I gotta favorite this internet site it seems very helpful very helpful
Great looking web site. Precisely what theme are you presently making use of?
Howdy exceptional website! Does running a blog such as this require a great deal of work? I’ve very little understanding of coding but I had been hoping to start my own blog in the near future. Anyway, if you have any recommendations or techniques for new blog owners please share. I know this is off topic but I simply had to ask. Thanks a lot!
A diamond ring with a flaw may be worth higher than a pebble without having flaws.
of course when you dont have time to cook, fastfoods would always be the best option”
Thanks-a-mundo for the blog.Really looking forward to read more. Awesome.
Youre so cool! I dont suppose Ive read anything similar to this just before. So nice to uncover somebody with some original thoughts on this subject. realy appreciate beginning this up. this fabulous website are some things that is needed online, a person with a bit of originality. beneficial project for bringing new things to your net!
You made a number of fine points there. I did a search on the topic and found most folks will agree with your blog.
I keep listening to the news update talk about getting boundless online grant applications so I have been looking around for the finest site to get one. Could you tell me please, where could i acquire some?
I as well as my pals were following the excellent tips and tricks on your web blog and then before long got an awful feeling I never expressed respect to the site owner for those secrets. All of the ladies were definitely consequently very interested to learn all of them and have very much been enjoying those things. Thanks for simply being quite considerate and for going for such quality areas most people are really needing to be aware of. My very own honest apologies for not saying thanks to you sooner.
Very interesting details you have observed , thanks for putting up.
I am glad to be one of the visitants on this outstanding website (:, appreciate it for posting .
being a blogger myself . i can see someone with great potential”
Aw, this became an exceptionally good post. In notion I have to invest writing similar to this additionally – taking time and actual effort to create a great article… but what can I say… I procrastinate alot through no indicates seem to go completed.
I am curious to find out what blog system you’re working with? I’m having some minor security issues with my latest site and I would like to find something more safe. Do you have any suggestions?
I couldn’t have really asked for a more rewarding blog. You’re there to give excellent suggestions, going directly to the point for simple understanding of your target audience. You’re surely a terrific expert in this subject. Thank you for remaining there human beings like me.
I am not sure the place you’re getting your information, however great topic. I must spend some time finding out much more or figuring out more. Thank you for great info I used to be looking for this information for my mission.
Fantastic blog you have here but I was wondering if you knew of any user discussion forums that cover the same topics talked about here? I’d really like to be a part of online community where I can get responses from other experienced people that share the same interest. If you have any recommendations, please let me know. Thanks a lot!
I precisely wanted to thank you so much once again. I am not sure the things I would’ve used in the absence of these thoughts documented by you about this question. It absolutely was a real frightening setting in my position, however , spending time with a specialised approach you handled it took me to cry for fulfillment. I will be happier for your service and in addition hope you know what a great job that you are accomplishing educating other individuals thru a site. Probably you haven’t met all of us.
I have read several good stuff here. Certainly price bookmarking for revisiting. I wonder how so much attempt you set to make this kind of great informative website.
What i don’t understood is in fact how you’re now not really a lot more smartly-preferred than you may be right now. You’re very intelligent. You realize thus significantly when it comes to this matter, produced me individually believe it from a lot of varied angles. Its like women and men are not fascinated unless it¡¦s one thing to do with Lady gaga! Your personal stuffs outstanding. At all times maintain it up!
It is in reality a great and helpful piece of information. I¡¦m glad that you shared this useful info with us. Please stay us informed like this. Thanks for sharing.
Excellent read, I just passed this onto a friend who was doing some research on that. And he actually bought me lunch because I found it for him smile Therefore let me rephrase that: Thanks for lunch!
Generally I don’t learn post on blogs, however I would like to say that this write-up very forced me to try and do it! Your writing taste has been amazed me. Thanks, quite great post.
wonderful issues altogether, you just won a new reader. What might you recommend in regards to your publish that you made some days in the past? Any sure?
thank you web site admin
There may be noticeably a bundle to find out about this. I assume you made certain good points in features also.
I think other site proprietors should take this web site as an model, very clean and fantastic user friendly style and design, let alone the content. You’re an expert in this topic!
I think other web site proprietors should take this site as an model, very clean and magnificent user genial style and design, let alone the content. You’re an expert in this topic!
Hello there, just became aware of your blog through Google, and found that it is truly informative. I’m going to watch out for brussels. I’ll be grateful if you continue this in future. Lots of people will be benefited from your writing. Cheers!
I’m not sure where you are getting your info, but good topic. I needs to spend some time learning more or understanding more. Thanks for magnificent info I was looking for this info for my mission.
I have been examinating out some of your stories and it’s nice stuff. I will definitely bookmark your blog.
Good ¡V I should certainly pronounce, impressed with your site. I had no trouble navigating through all the tabs as well as related info ended up being truly easy to do to access. I recently found what I hoped for before you know it at all. Quite unusual. Is likely to appreciate it for those who add forums or anything, web site theme . a tones way for your client to communicate. Excellent task..
of course like your website however you need to check the spelling on several of your posts. Several of them are rife with spelling issues and I to find it very bothersome to inform the reality then again I will surely come back again.
Great post. I was checking constantly this blog and I am impressed! Very helpful information specially the last part 🙂 I care for such info much. I was seeking this certain info for a very long time. Thank you and good luck.
I was recommended this website by my cousin. I am not sure whether this post is written by him as nobody else know such detailed about my problem. You are incredible! Thanks!
Thanks for sharing superb informations. Your site is very cool. I’m impressed by the details that you¡¦ve on this site. It reveals how nicely you understand this subject. Bookmarked this web page, will come back for more articles. You, my friend, ROCK! I found simply the information I already searched everywhere and simply couldn’t come across. What a great web site.
Someone necessarily help to make critically articles I would state. That is the very first time I frequented your website page and up to now? I surprised with the research you made to make this actual publish extraordinary. Great task!
I loved as much as you’ll receive carried out right here. The sketch is tasteful, your authored subject matter stylish. nonetheless, you command get got an shakiness over that you wish be delivering the following. unwell unquestionably come more formerly again as exactly the same nearly a lot often inside case you shield this hike.
hello!,I love your writing very a lot! share we keep up a correspondence more about your post on AOL? I need a specialist in this space to unravel my problem. Maybe that is you! Looking forward to look you.
My husband and i felt really relieved when Louis could carry out his inquiry through the ideas he obtained from your site. It is now and again perplexing to just happen to be making a gift of procedures which often men and women have been trying to sell. We really figure out we have got the blog owner to be grateful to because of that. Most of the explanations you made, the straightforward blog menu, the relationships you aid to create – it is many powerful, and it’s really assisting our son and our family consider that this subject matter is pleasurable, which is exceedingly fundamental. Thank you for all the pieces!
Thanks a lot for giving everyone remarkably memorable chance to read articles and blog posts from this website. It’s always very enjoyable and as well , full of a great time for me personally and my office co-workers to visit your website a minimum of three times in a week to see the latest issues you have. And lastly, I am also always contented for the good tips you give. Selected 3 ideas on this page are essentially the most beneficial I’ve ever had.
Its like you read my mind! You seem to know a lot about this, like you wrote the book in it or something. I think that you could do with a few pics to drive the message home a little bit, but other than that, this is great blog. An excellent read. I will certainly be back.
Hi there very cool site!! Man .. Beautiful .. Wonderful .. I will bookmark your website and take the feeds additionally¡KI am happy to find a lot of helpful information here within the publish, we want work out extra techniques in this regard, thanks for sharing. . . . . .
Wow! Thank you! I continually wanted to write on my website something like that. Can I include a portion of your post to my site?
I have been browsing online more than 3 hours today, yet I never found any interesting article like yours. It is pretty worth enough for me. Personally, if all site owners and bloggers made good content as you did, the web will be a lot more useful than ever before.
I¡¦ve been exploring for a bit for any high-quality articles or weblog posts on this kind of space . Exploring in Yahoo I ultimately stumbled upon this site. Reading this info So i¡¦m happy to convey that I’ve an incredibly good uncanny feeling I came upon exactly what I needed. I most definitely will make sure to don¡¦t disregard this website and provides it a look on a continuing basis.
Helpful information. Lucky me I discovered your website by chance, and I am shocked why this accident didn’t came about in advance! I bookmarked it.
There is noticeably big money to comprehend this. I assume you’ve made particular nice points in functions also.
You are so interesting! I don’t think I’ve truly read anything
like this before. So wonderful to discover someone
with genuine thoughts on this subject matter. Seriously..
thank you for starting this up. This site is something that’s needed
on the internet, someone with a bit of originality!
Hey there are using WordPress for your site platform? I’m new to the blog world but
I’m trying to get started and set up my own. Do you require any coding expertise
to make your own blog? Any help would be greatly appreciated!
I like the valuable information you provide in your articles. I’ll bookmark your weblog and check again here frequently. I am quite sure I will learn plenty of new stuff right here! Best of luck for the next!
thank you web sites.
It¡¦s actually a cool and useful piece of info. I¡¦m happy that you shared this useful information with us. Please stay us up to date like this. Thank you for sharing.
Thank you for another excellent post. Where else may anybody get that type of info in such an ideal manner of writing? I’ve a presentation next week, and I am on the look for such information.
Great beat ! I wish to apprentice while you amend your site, how could i subscribe for a blog web site? The account aided me a acceptable deal. I had been a little bit acquainted of this your broadcast provided bright clear idea
Excellent read, I just passed this onto a friend who was doing some research on that. And he just bought me lunch since I found it for him smile So let me rephrase that: Thanks for lunch!
Hi there, I discovered your blog by way of Google at the same time as searching for a related subject, your web site came up, it appears great. I have bookmarked it in my google bookmarks.
Everything is very open with a precise clarification of the challenges.
It was really informative. Your website is very useful.
Many thanks for sharing!
Great blog here! Also your site loads up fast! What web host are you using? Can I get your affiliate link to your host? I wish my site loaded up as fast as yours lol
Wow! This can be one particular of the most beneficial blogs We’ve ever arrive across on this subject. Actually Wonderful. I am also a specialist in this topic therefore I can understand your hard work.
I¡¦m no longer sure where you’re getting your info, however great topic. I must spend some time finding out more or figuring out more. Thanks for excellent info I was looking for this info for my mission.
I’m still learning from you, while I’m trying to achieve my goals. I certainly liked reading everything that is written on your website.Keep the tips coming. I loved it!
thank you admin
very good put up, i actually love this web site, keep on it
Wow! This can be one particular of the most helpful blogs We have ever arrive across on this subject. Basically Great. I am also a specialist in this topic so I can understand your hard work.
I believe this website has got some really fantastic info for everyone : D.
My brother recommended I might like this website. He was entirely right. This post actually made my day. You can not imagine simply how much time I had spent for this info! Thanks!
Generally I don’t read post on blogs, however I wish to say that this write-up very compelled me to check out and do it! Your writing style has been amazed me. Thanks, very nice post.
Thanks for this grand post, I am glad I observed this website on yahoo.
Thanks so much for providing individuals with an exceptionally memorable possiblity to read in detail from here. It is often so lovely and as well , packed with a great time for me and my office friends to search your blog at the least three times a week to see the latest stuff you have. Not to mention, I am also certainly impressed considering the outstanding tricks you serve. Some two tips in this article are absolutely the simplest I’ve ever had.
Hello, you used to write wonderful, but the last several posts have been kinda boring¡K I miss your super writings. Past several posts are just a little out of track! come on!
I have been surfing online more than 3 hours today, yet I never found any interesting article like yours. It’s pretty worth enough for me. In my opinion, if all site owners and bloggers made good content as you did, the internet will be a lot more useful than ever before.
WOW just what I was looking for. Came here by searching
for Coach Charter Services
I’ve been absent for some time, but now I remember why I used to love this web site. Thank you, I will try and check back more often. How frequently you update your web site?
Aw, the labyrinth was such a good post. From opinion I have to make a note of enjoy this further . . . slacking and as a consequence real world project carryout a top notch article… anyhow assist with Naturally i say… I personally put it off a large amount certainly not the slightest bit appear go undertaken.
You made some respectable points there. I seemed on the web for the issue and found most people will go together with along with your website.
Thank you for sharing superb informations. Your site is so cool. I am impressed by the details that you have on this blog. It reveals how nicely you perceive this subject. Bookmarked this web page, will come back for more articles. You, my pal, ROCK! I found just the info I already searched everywhere and just could not come across. What a perfect website.
thank you web site admin
What i do not understood is actually how you’re not really much more well-favored than you might be right now. You are so intelligent. You realize therefore considerably in terms of this subject, made me for my part consider it from numerous varied angles. Its like men and women aren’t interested until it is something to do with Girl gaga! Your own stuffs great. At all times take care of it up!
Its like you read my mind! You appear to know so much about this, like you wrote the book in it or something. I think that you could do with some pics to drive the message home a bit, but instead of that, this is excellent blog. A great read. I will certainly be back.
Very good written post. It will be helpful to everyone who utilizes it, including myself. Keep up the good work – i will definitely read more posts.
I discovered your blog post web site online and appearance several of your early posts. Always maintain in the great operate. I recently additional your Feed to my MSN News Reader. Seeking forward to reading a lot more from you finding out afterwards!…
This reminds me of the other comment I was seeing
Youre so cool! I dont suppose Ive learn anything like this before. So good to find someone with some unique thoughts on this subject. realy thank you for beginning this up. this website is one thing that’s wanted on the web, someone with a bit originality. helpful job for bringing one thing new to the web!
you are truly a excellent webmaster. The site loading velocity is amazing. It kind of feels that you are doing any distinctive trick. Moreover, The contents are masterpiece. you’ve done a magnificent task on this matter!
I just want to mention I’m all new to blogs and certainly savored you’re web site. More than likely I’m want to bookmark your site . You surely have good writings. Appreciate it for sharing your web page.
I would like to thank you for the efforts you’ve put in writing this web site. I am hoping the same high-grade website post from you in the upcoming as well. Actually your creative writing skills has encouraged me to get my own web site now. Actually the blogging is spreading its wings quickly. Your write up is a great example of it.
Great goods from you, man. I’ve understand your stuff previous to and you are just too great. I really like what you’ve acquired here, certainly like what you’re stating and the way in which you say it. You make it entertaining and you still care for to keep it sensible. I can not wait to read far more from you. This is actually a wonderful website.