Mental Math Estimate Sums and Differences

Estimate the sum of 37+99 by rounding to the nearest tens

• 120
• 150
• 140
• 136

Estimate the sum of 52+59 by rounding to the nearest tens

• 110
• 100
• 111
• 90

Estimate the sum of 120+190 by rounding to the nearest hundreds

• 100
• 200
• 0
• 300

Estimate the sum of 327+431 by rounding to the nearest hundreds

• 700
• 600
• 758
• 800

237 fifth graders and 346 fourth graders went on a field trip. Estimate how many more fourth graders were on a field trip than fifth graders.

• 200 more
• 109 more
• 100 more
• 110 more

Eastfield college has 1,537 students. Richland college has 2,785. Rounding to the HUNDREDS place, approximately how many fewer students does Eastfield college have than Richland college.

• 1,300
• 1,200
• 1,100
• 1,500

Mr. Smith drove 1,380 miles in the month of August and 656 miles in the month of September. Approximately how many miles did he drive all together.

• 2,000.
• 2,100.
• 2,036.
• 2,500.

Estimate the difference of 7,900-2,999 by rounding to the nearest thousands

• 6,000
• 4,000
• 5,000
• 3,000

Tracy ordered 325 pet toys and 165 bags of dog food for her new pet store. Which is the best estimate of the total number of items Tracy ordered?

• 400
• 500
• 600
• 700

There was 926 people at basketball tournament. 607 people left before noon. Which is the best estimate of the number of people who stayed?

• 150
• 250
• 300
• 500