Rounding
Estimation
Addition
Subtraction
Word Problems
100
Round 85 to the nearest ten.
90
100
Estimate the sum of 365 + 423 by rounding to the nearest 100. Show your work.
400 + 400 = 800
100
Find the sum of 3,456 + 2,183.
5,639
100
Find the difference of 6,782 - 4,339.
2,443
100
Melissa had $345 and Rodney had $557. About how much did they have altogether? Show your work.
Altogether, they have about $900 (rounding) or $800 (front-end estimation).
200
Round 4,560 to the nearest 100.
4,600
200
Estimate the difference of 703 - 552 by rounding to the nearest hundred. Show your work.
700 - 600 = 100
200
Find the sum of 21,387 + 18,415.
39,802
200
Find the difference of 4,925 - 1,873.
3,052
200
Karen bought a car for $34,502 and Emily bought a car for $29,877. How much more did Karen spend than Emily? Show your work.
Karen spent $4,625 more than Emily.
300
Round 83,207 to the nearest ten thousand.
80,000
300
Estimate the sum of 365 + 423 by using front-end estimation. Show your work.
300 + 400 = 700
300
Find the sum of 4,099 + 8,136.
12,235
300
Find the difference of 40,025 - 27,945.
12,080
300
Karen bought a car for $36,502 and Emily bought a car for $29,877. About how much more did Karen spend than Emily? Show your work.
Karen spent about $10,000 more than Emily. (rounding or front-end)
400
Round 37,492 to the nearest ten thousand.
40,000
400
Estimate the difference of 703 - 552 by using front-end estimation. Show your work.
700 - 500 = 200
400
Find the sum of 87,394 + 56,348.
143,742
400
Find the difference of 85,901 - 49,736
36,165
400
Mark wanted to buy a new computer for $4,589. If he paid with $5,000, about how much change did he receive? Show your work.
He received about $400 in change.
500
Round 496,985 to the nearest 10,000.
500,000
500
Estimate the difference of 40,025 - 27,945 by rounding to the nearest 10,000.
40,000 - 30,000 = 10,000
500
Find the sum of 38,975 + 83,446.
122,421
500
Find the difference of 70,000 - 54,283.
15,717
500
If Charlie has 44,026 stickers and Marcy has 51,876, who has more stickers and how many more stickers?
Marcy has 7,850 more stickers.
M
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