KS3 Maths Quiz
The Royal Opera House has 2,256 seats. To the nearest 10, approximately how many seats are there?

# Level 5-6 Numbers - Approximating

In KS3 Maths you'll have to work out some problems involving large numbers. Before you work them out it's a good idea to have some idea of what the answer will be. That's where approximations come in.

Approximations give you a rough idea what the result of a calculation will be. Though you still have to work them out, the numbers involved are much easier to deal with as they end in zeros. Approximations are made by rounding numbers up or down to the nearest 10, 100 or even 1,000. Say you are asked to multiply 87 x 23. That would be hard but if you round the figures up/down it becomes simpler: 90 x 20 = 1,800. This answer is of course wrong, but it is quite close to the actual answer you want: 87 x 23 = 2,001. It is useful to approximate the answer to calculations so that you can check if your answers are correct.

Test your knowledge of approximating in the following quiz. Take your time and read each question carefully. Good luck!

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1. By rounding to the nearest 10, what is the approximate answer to 1,537 / 222?
Remember to round the numbers in the calculation. 1,540 / 220 = 7
2. To the nearest 100, round 6,691 and 468.
I hope you didn't round 6,691 up to 7,000!
3. Give the answer to 7,743 / 5 to the nearest 100.
7,700 / 5 = 1,540 which is 1,500 to the nearest 100
4. By rounding to the nearest 10, what is the approximate answer to 79 x 22?
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
5. The length of a football pitch is 110m to the nearest 10 metres. What is the smallest possible length it could be?
Remember to round up if the value is halfway!
6. By rounding 5,639 x 147 to the nearest 10, what is the approximate answer?
The calculation becomes 5,640 x 150 which equals 846,000
7. A tombola holds 27,600 tickets to the nearest 100. What is the maximum number of tickets in the tombola?
One more ticket and it would be rounded up to 27,700!
8. To the nearest 100, round 4,483 and 4,999.
4,999 goes up 1 to 5,000 but 4,483 goes up 17 to 4,500
9. To the nearest 10, round 4,483 and 4,999.
Be careful not to confuse 100s and 10s
10. The Royal Opera House has 2,256 seats. To the nearest 10, approximately how many seats are there?
6 is closer to 10 than it is to 0

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