3RD GRADE MATH - ESTIMATING SUM OF NUMBERS
Estimating the Sum of Given Numbers
We need estimation, when we don’t want an exact answer. Estimation is a fare guess of the sum and is close to the actual answer reasonably.
For example; Robin has 37 white marbles and 83 red marbles. About how many marbles Robin has?
To answer the above question we don't need to actually add the given numbers but need to give a good estimation of the sum of the numbers. The best approach to estimating sums is to round to nearest tens, hundreds or thousands.
As the given numbers are less than one hundred we can round them to nearest tens as shown below:
37 rounded to closest tens = 40
83 rounded to closest tens = 80
And 40 + 80 = 120 (we just add tens in our mind i.e. 4 tens + 8 tens = 12 tens = 120)
So, Robin has about 120 marbles all together.
Problem 2: Steve had $785 in his account before he deposited another $518 to his account. Find the approximate balance in Steve's account after the deposit?
Solution: We need to round both the numbers to nearest hundreds in this case and then add the results:
785 rounded to nearest hundreds = 800
518 rounded to nearest hundreds = 500
Estimated sum = 800 + 500 = 1 300
Hence, Steve had approximately $1 300 in his bank account after the deposit.
If 3rd grade students get able to estimate numbers to hundreds, this is a very good basic math achievement in arithmetic. But we can encourage them to do better than that.
Below are the two worksheets to practice and get comfortable with estimating sums for 3rd grade math level;
Below is the link to 2nd grade math page, where you can print all the content for 2nd grade math
2ND GRADE MATH CORE CURRICULUM
Below are the links to my previous posts on 3rd grade math;
https://steemit.com/steemiteducation/@mathworksheets/3rd-grade-math-worksheets-on-estimating-numbers
https://steemit.com/steemiteducation/@mathworksheets/3rd-grade-math-comparing-and-ordering-numbers-1
https://steemit.com/steemiteducation/@mathworksheets/3rd-grade-math-comparing-numbers-worksheets
https://steemit.com/steemiteducation/@mathworksheets/3rd-grade-math-ordering-numbers-worksheets
https://steemit.com/steemiteducation/@mathworksheets/3rd-grade-math-rounding-numbers-to-nearest-ten
https://steemit.com/steemiteducation/@mathworksheets/3rd-grade-math-skip-counting-by-5s-worksheets
https://steemit.com/steemiteducation/@mathworksheets/3rd-grade-math-simple-addition-equations
https://steemit.com/steemiteducation/@mathworksheets/3rd-grade-math-adding-two-4-digit-numbers
great sharing. keep your post continue. thanks brother
I will, thanks for the encouragement :))
For you,and your great post
Thanks for such a nice gift!
Continue sharing dude. It shows maths is not that hard😊
Step by step math learning is easy!
Super agree to this! just do it step by step, slowly learning those steps will lead us closer to loving math😊.. a long term experience for students in which you - a great and loving teacher is the reason.
I hate maths .
Every question have its own formula own method .
I am doing engineering but maths . huh i hate it .
Its so simple but later on the simple one will be the most problomatic thing .
But its good information keep it up
Thanks for your feedback @topstoriez. You need math in engineering even you hate it or love it :))
Yep .its main problem to me huh . i love structure designing but math.....😢
sure i will share this to the kids who will solve them :)
cool worksheets to be solved today thanks for sharing
estimating worksheets great will share them :)
this is really fantastic work sir thanks for sharing these worksheets
Estimating the sum of numbers is very useful for us in our daily life. Thanks for your post.
Yes @gautam, very handy basic math skill!
Waoo me encanto tu post , hay que estar activos para las matematicas jejje nunca se equivocan ,saludos.