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Approximations are made by rounding numbers up or down. It is useful to approximate the answer to calculations in math. It means you can check if your answers are correct.

Test your knowledge of approximating in the following quiz.

1.

By rounding 5,639 x 147 to the nearest 10, what is the approximate answer?

800,000

836,000

840,000

846,000

The calculation becomes 5,640 x 150 which equals 846,000

2.

The Royal Opera House has 2,256 seats. To the nearest 10, approximately how many seats are there?

2,000

2,200

2,260

2,270

3.

The length of a football pitch is 110m to the nearest 10 meters. What is the smallest possible length it could be?

100

105

107

110

Remember to round up if the value is halfway!

4.

To the nearest 100, round 6,691 and 468.

6,000 and 400

6,000 and 500

6,600 and 500

6,700 and 500

5.

A tombola holds 27,600 tickets to the nearest 100. What is the maximum number of tickets in the tombola?

27,600

27,649

27,650

27,700

One more ticket and it would be rounded up to 27,700!

6.

By rounding to the nearest 10, what is the approximate answer to 1,537 / 222?

7

7.2

7.4

7.5

Remember to round the numbers in the calculation. 1,540 / 220 = 7

7.

By rounding to the nearest 10, what is the approximate answer to 79 x 22?

1,500

1,600

1,700

1,800

To approximate the answer, we need to round the numbers in the calculation. So 79 becomes 80 and 22 becomes 20. 80 x 20 = 1,600

8.

To the nearest 10, round 4,483 and 4,999.

4,400 and 4,900

4,480 and 5,000

4,490 and 4,990

4,490 and 5,000

9.

To the nearest 100, round 4,483 and 4,999.

4,400 and 4,800

4,400 and 4,900

4,500 and 4,900

4,500 and 5,000

10.

Give the answer to 7,743 / 5 to the nearest 100.

100

1,400

1,500

1,600

7,700 / 5 = 1,540 which is 1,500 to the nearest 100