# Week 3 30th Mar - 3rd Apr

Mental Maths Topic This Week: Halving (dividing by 2)

https://www.topmarks.co.uk/maths-games/hit-the-button

Topic: Fractions, Decimals & Percentages

PERCENTAGES OF NUMBERS (Monday's worksheet)

When finding percentages there are several ways to find a percentage of a number

For example:

If I need to find 10% of £20

I know that 10 goes into 100 ten times, therefore I can divide £20 by ten to find my answer

20 ÷ 10 = 2

Another way to find a percentage of a number is...

15% of £120

I could first find what 1% is by dividing the £120 by 100

120 ÷ 100 = £1.20    so 1% = £1.20

Because I need to find 15%, I can now multiply this number by 15

1.20 x 15 = 18

Therefore 15% of £120 = £18

TURNING DECIMALS INTO FRACTIONS

On Tuesday's worksheet you will be asked to find answers with fractions

Example: 42 ÷ 5 = 8 remainder 4

This can be written as 8.4

We now need to turn this .4 into a fraction

Because the 4 is a tenth we can write it as 4/10   (4 tenths)

It can also be simplified by dividing both numbers by 2, giving your 2/5

Therefore your answer could be 8 and 4/10's or 8 and 2/5's

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