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Estimating Sums Worksheet

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Estimating Sums Worksheet

Round whole numbers to the nearest thousand, then use the rounded numbers to estimate sums. Show your rounding and use “about” or “close to” when you describe an estimate.

Round to the nearest thousand

For each number, write the nearest thousand.

1.Round 3,648 to the nearest thousand.

2.Round 7,251 to the nearest thousand.

3.Round 5,782 to the nearest thousand.

4.Round 2,499 to the nearest thousand.

5.Which number rounds to 8,000 when rounded to the nearest thousand?

7,438
8,612
8,499
9,105

6.Which number rounds to 6,000 when rounded to the nearest thousand?

5,682
6,590
4,950
7,001

7.Match each number to its nearest thousand.

4,735
9,216
1,381
6,520

9,000
5,000
1,000
7,000

Estimate sums

Round each addend to the nearest thousand before adding. Write the rounded calculation and the estimated total.

8.Estimate 5,638 + 3,271 by rounding each number to the nearest thousand.

9.Estimate 8,462 + 2,735 by rounding each number to the nearest thousand.

10.Estimate 6,519 + 4,482 by rounding both addends to the nearest thousand.

11.Choose the best estimate for 7,348 + 5,821 when each addend is rounded to the nearest thousand.

About 12,000
About 13,000
About 14,000
About 15,000

12.Estimate 3,492 + 6,516 by rounding both numbers to the nearest thousand. Write the rounded addition and its total.

13.Explain why rounding 4,672 + 2,228 to the nearest thousand gives an estimate of about 7,000. Include the rounded addends in your explanation.

Estimation in everyday situations

Use nearest-thousand rounding to find a sensible estimate. You do not need to calculate the exact total.

14.A community centre orders sports gear for $3,748 and art materials for $2,619. Estimate the total cost by rounding each price to the nearest thousand. Give your answer in dollars.

15.A nature reserve had 5,284 visitors in one month and 3,765 the next month. Estimate the number of visitors across both months by rounding to the nearest thousand.

16.A library counted 6,438 books in one collection and 4,351 books in another. Estimate how many books there are altogether. Show each rounded number and use “close to” in a sentence about your estimate.