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Level 5-6 Numbers - Decimals - Multiplication and Division
There are 10 millimetres in a centimetre.

Level 5-6 Numbers - Decimals - Multiplication and Division

In KS3 Maths, after adding and subtracting, we dive into multiplication and division – the everyday heroes of maths, we use them in junior school, secondary, college and university. What's different about them in this quiz? Well, the questions below will help you divide and multiply decimals.

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Multiplying and dividing decimals is a lot like regular numbers, but the key is where you place the decimal point. Making a guess before you calculate can be handy. For example, if you multiply 2.3 by 4.01, you know the answer is around 9, not 92,000! Even better, learn the rules for decimal points in multiplication and division – it makes solving problems a breeze.

In the quiz below, try estimating your answers before diving into calculations – it'll help! Best of luck with your KS3 Maths journey!

1.
Joseph spends a total of £34.44 on four new rose bushes for his garden. How much is one rose bush?
£3.40
£3.44
£8.44
£8.61
34 ÷ 4 = 8.5 and 0.44 ÷ 4 = 0.11. Add these two figures together for the answer
2.
What is 2.42 x 5?
10.2
11.7
12.1
13.5
To multiply by 5 simply move all the digits one place to the left and then halve the answer
3.
How would you write 655.35mm in centimetres?
65.535cm
655.35cm
6,553.5cm
6,600cm
To divide by 10 just move all the digits one space to the right
4.
What is 1,270.5 ÷ 15?
82.7
84.7
86.7
88.7
You could work this one out in your head by first dividing 1,270.5 by 3 to get 423.5. Next you would divide 423.5 by 10 to get 42.35 (one 30th of 1,270.5). Multiply this number by 2 for the answer: 84.7. Or you could use pen and paper - much easier!
5.
A t-shirt costs £5.99. Mrs. Crawford bought one each for her four children. How much did she spend?
£20.00
£22.96
£23.96
£24.50
Remember to estimate the answer. £6.00 x 4 = £24.00, so the figure should be close to this
6.
What is 48.44 x 7?
339.08
340.44
484.47
500
An approximation would be 50 x 7 = 350 so you know straightaway that last two answers are wrong
7.
If a tube of toothpaste costs £1.57, how much do three tubes cost?
£3.15
£4.50
£4.66
£4.71
To double-check your answer, £1.57 + £1.57 + £1.57 is the same as £1.57 x 3!
8.
There are 10 millimetres in a centimetre. How would you write 34.12cm in millimetres?
3.412mm
34.12mm
341.2mm
3,412mm
Remember - all the digits move one place to the left when multiplying by 10
9.
What is 6.04 ÷ 4?
1
1.4
1.5
1.51
6 ÷ 4 =1.5 and 0.4 ÷ 4 = 0.01. Now just add these two figures together
10.
Joanne is building a bookcase and needs 38 fixings at 14p each. How much in total will she pay for the fixings?
£3.40
£5.32
£53.20
£532.00
Remember that 14p = 0.14 when written in decimals!
You can find more about this topic by visiting BBC Bitesize - Decimals

Author:  Frank Evans
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