Estimating Differences
Estimate the difference by rounding to the nearest ten.
78 - 51
30
Estimate by rounding to the nearest ten.
Hannah has 67 orange marbles, she gave Talia 34 of the orange marbles. About how many orange marbles does she now own?
About 40 marbles
Estimate the sum by rounding to the nearest hundred.
78 + 15
100
Emily worked on the farm storing bales of hay in the barn. The first day she stacked 54 bales and 36 bales on the second day. About how many bales were stored in the barn?
About 90 bales
Estimate the difference by rounding to the nearest ten.
62- 23
40
Estimate by rounding to the nearest ten.
The soccer team scored 87 goals this season and 62 goals last season. About how many more goals did they score this season?
About 30 more goals
Estimate the sum by rounding to the nearest hundred.
429 + 272
700
While fishing over the weekend Jacob caught 43 and Liam caught 29 fish. About how many fish were caught in total?
About 70 fish
Estimate the difference by rounding to the nearest hundred.
367 - 289
100
Estimate by rounding to the nearest hundred.
Kara has 238 coins, but she spends 125 of them at the arcade. About how many coins does she have left?
About 100 coins
Estimate the sum by rounding to the nearest hundred.
489 + 213
700
Lee buys a pack of markers for $247 and a set of colored pencils for $182. Estimate the total cost of all the supplies.
About $400
Estimate the difference by rounding to the nearest hundred.
932 - 76
800
Estimate by rounding to the nearest hundred.
Annalise has 317 stickers in her collection. She gives away 128 to her friends. About how many stickers does she have left?
About 200 stickers
Estimate the sum by rounding to the nearest hundred.
639 + 243
800
Ben drives 358 miles on the first day of his trip and 472 miles on the second day. Estimate the total distance he traveled over the two days.
About 900 miles
Estimate the difference by rounding to the nearest thousand.
5,431 - 2,987
2,000
Estimate by rounding to the nearest ten. (BE CAREFUL!)
The school planned for 432 students to go on a field trip, but 176 students were absent. About how many students actually went on the trip?
About 250 students
Estimate the sum by rounding to the nearest thousand.
6,890 + 789
8,000
Lisa made 215 vanilla cupcakes and 178 chocolate cupcakes for her party. About how many cupcakes did she make?
About 400 cupcakes