Estimating Sums and Differences
Estimate the difference 478 - 123 rounding to the nearest ten.
Rounding to the nearest ten: 480 - 120 = 360.
Solve: 25 + 37 =
62
Solve: 100 − 37 =
63
Solve: 1.2 + 3.7 =
4.9
You have 15 pencils in your pencil case. If you give 3 pencils to your friend, how many pencils are left in your pencil case?
Answer: 15−3=1215 - 3 = 1215−3=12
There are 12 pencils left.
Estimate 147 + 312 rounding to the nearest ten.
Rounding to the nearest ten: 150 + 310 = 460.
Solve: 349 + 652 =
1,001
Solve: 530 − 215 =
315
Solve: 6.8 − 2.5 =
4.3
There are 60 books in the library. If 25 books are borrowed by students, how many books are still in the library?
Answer: 60−25=3560 - 25 = 3560−25=35
35 books are still in the library.
Estimate the difference of 600 - 275 rounding to the nearest hundred.
Round both to the nearest hundred: 600 - 300 = 300
Solve: 123 + 578 =
701
Solve: 650 − 400 =
250
Solve: 4.5 + 3.2 =
7.7
Emma walks 12 kilometers on Saturday and 8 kilometers on Sunday. How many kilometers does she walk in total over the weekend?
Answer: 12+8=2012 + 8 = 2012+8=20
Emma walks 20 kilometers in total.
Estimate 256 + 389 rounding to the nearest hundred.
Round both to the nearest hundred: 300+400=700
Solve: 759 + 184 =
943
Solve: 900 − 375 =
525
Solve: 5.7 − 1.2 =
4.5
A bakery baked 72 cupcakes in the morning. They sold 39 cupcakes by the afternoon. How many cupcakes are left?
Answer: 72−39=3372 - 39 = 3372−39=33
33 cupcakes are left.
Estimate the sum of 198 + 462.
Answer Options:
Solve: 478 + 265 =
743
Solve: 732 − 458 =
274
Solve: 3.4 + 2.6 =
6.0
Liam has 24 marbles. He buys 16 more and then gives 10 to his friend. How many marbles does Liam have left?
Answer: 24+16−10=3024 + 16 - 10 = 3024+16−10=30
Liam has 30 marbles left.