Estimating Sums
Round each number to the nearest thousand and then add or subtract.
70,499 + 8,391
78,000
What is the sum of 46,359 + 1,273?
47,632
3,761 - 540
3,221
Estimate the sum by rounding each number to the nearest thousand and then adding.
8,404 + 1,953
10,000
Round each number to the nearest thousand and then add or subtract.
88,521 − 9,263
80,000
Some insects called aphids attack a large farm. In response, the farmer releases ladybugs onto the fields. There are 3,353 ladybugs with spots and 1,673 ladybugs without spots. How many ladybugs are there in all?
5,026
The Newberry Middle School cafeteria goes through a lot of regular and crunchy peanut butter. Currently, they have a total of 7,370 ounces of peanut butter in stock. If they have 4,957 ounces of crunchy peanut butter, how many ounces of regular peanut butter do they have?
2,413 ounces
How much greater is 579,611 than 185,105?
394,506
Bailey wrote the number 187,296. Alex wrote the number 592,479. What is the estimated sum of their numbers rounded to the nearest hundred thousand?
800,000
7,218 + 32,849
40,067
Find the difference.
682,741 − 95,126
587,615
The length of a rectangle is 8 inches. The width of the rectangle is 4 inches. What is the perimeter of the rectangle?
24 inches
James has a goal of reading 3,250 pages. He reads 384 pages.
James writes the expression 3,300 + 400 to estimate how many more pages he needs to read. Is his estimate reasonable?
A No, he should have rounded 3,250 to 3,200 instead.
B No, he should have subtracted from 3,300 instead of adding.
C Yes, he correctly rounded each number to the nearest hundred.
D Yes, he correctly rounded each number to the nearest thousand.
B No, he should have subtracted from 3,300 instead of adding.
A blue whale weighed 8,065 pounds. Then it gained 4,401 pounds. How much does the blue whale weigh now?
12,466
The total attendance for a fair last year was 162,573 people. The total attendance this year was 159,865 people. How many fewer people attended the fair this year than last year?
2,708 people
Bailey wrote the number 287,932 Alex wrote the number 743,892. What is the estimated sum of their numbers rounded to the nearest hundred thousand?
1,000,000
Round each number to the nearest thousand and then add or subtract.
63,901 + 15,899
80,000
245,689 + 349,982
595,671
James has a goal of reading 3,250 pages. He reads 384 pages.
How many more pages does James need to read to reach his goal?
2,866 pages
A rectangle has a length of 15 meters and a width of 12 meters. What is the perimeter of the rectangle in meters?
54