Rounding
Adding
Subtracting
Estimating Sums
Estimating Differences
100

53 rounded to the nearest 10

50

100

241 + 366

607

100

577 - 237

340

100

Miss Shipwash bought a cake for $47 and cupcakes for $36. About how much did she spend in total rounded to the nearest 10?

$80

100

753 - 290 rounded to the nearest 100

500

200

Jok noticed he had about $200 in his savings. If he rounded to the nearest 100, what is the exact amount of money he had in his savings account?

A. 137

B. 251

C. 181

D. 147

C. 181

200

The school bought 235 pencils for the 3rd grade and 187 pencils for the 4th grade.
How many pencils did the school buy in total?

422 pencils

200

211 - 96

115

200

237 + 298 rounded to the nearest 10

540

200

There were 276 students in the 3rd grade, and 139 went on the field trip. Estimate how many students stayed behind?

140 students

300

3 rounded to the nearest 10

0

300

852 + 735

1587

300

The zoo had 725 tickets to sell for the day, at the end of the day they had 368 tickets left. How many tickets were sold?

357 tickets

300

The Johnson family drove 246 miles on the first day of their trip and 173 miles on the second day. Approximately how many miles did they drive in total to the nearest 10?

420 miles

300

800 - 431 rounded to the nearest 10

370

400

Estimate 350 to the nearest 100

400

400

One airplane carried 528 passengers, the next airplane carried 439 more passengers than the first. How many passengers were on the second airplane?

967 passengers

400

A warehouse stored 903 boxes of goods. After shipping out some orders, 486 boxes remained.
How many boxes were shipped out?

417 boxes

400

860 + 359 rounded to the nearest 100

1200

400

The race track is 812 meters long. Jack has already run 473 meters. Approximate how much farther does Jack need to run to the nearest 100?

300 meters

500

Wallburg has about 1340 students. If we rounded to the nearest 10, what is the exact number of students at Wallburg?

A. 1345 students

B. 1333 students

C. 1342 students

D. 1442 students

C. 1342 students

500

Kylie read 312 pages on Monday, 198 on Tuesday, and 245 pages on Wednesday.
How many pages did she read for the week? 

755 pages

500

Tinley has $300 to spend at the mall. She buys a purse for $97, and buys shoes for $104. How much money does Tinley have left?

$99

500

A school ordered 546 crayons, 413 erasers, and 568 pencils for the students. About how much supplies did the school order in all rounded to the nearest 100?

1500 supplies

500
The Long family has $905 to spend on their vacation. If they spend $314 on the first day, and $456 on the second day. About how much money do they have left rounded to the nearest 10?

$140