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Level 5-6 Numbers - Fractions - Addition and Subtraction
What is 1/8 of £20.00?

Level 5-6 Numbers - Fractions - Addition and Subtraction

Learn how to add and subtract fractions in KS3 Maths. Fractions are useful in real life for time, recipes, and sharing things equally.

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Fascinating Fact:

In time, 1?4 of an hour plus 1?2 of an hour is 3?4 of an hour, which equals 45 minutes.

In KS3 Maths, pupils learn to add and subtract fractions by finding a common denominator and combining numerators. This skill helps when comparing quantities or solving problems involving parts of a whole.

  • Fraction: A number that shows part of a whole, written with a numerator and denominator.
  • Numerator: The top number in a fraction, showing how many parts are being considered.
  • Denominator: The bottom number in a fraction, showing how many parts make up a whole.
How do you add fractions in KS3 Maths?

To add fractions, make the denominators the same, then add the numerators while keeping the denominator unchanged. Simplify the result if possible.

How do you subtract fractions with different denominators?

Find the lowest common denominator, convert each fraction to have it, then subtract the numerators and simplify your answer.

Why is learning about fractions important?

Fractions are used in daily life, such as dividing time, measuring ingredients, and managing money. They help build a strong foundation for algebra and ratios.

1 .
What is the lowest common multiple of the denominators in 1/4 + 1/2?
1
2
3
4
4 is the lowest common multiple of 4 and 2, therefore change 1/2 into an equivalent fraction with a denominator of 4
2 .
What is 1/8 of £20.00?
80p
£1.20
£1.25
£2.50
1/8 of £20.00 is the same as 1/4 of £10.00
3 .
How many sixths are there in 356?
15
17
23
27
There are 18/6 in 3 plus the remaining 5/6 makes 23
4 .
What is the lowest common multiple of the denominators in 3/4 - 1/5?
9
12
18
20
It is the smallest number in the 4 and 5 times table
5 .
What is 3/5 - 1/4?
4/10
4/20
7/10
7/20
20 is the lowest common multiple of 4 and 5 so we convert both fractions to 20ths
6 .
What is 1/4 + 1/2?
1/8
2/6
3/4
4/9
4 is the lowest common multiple of the denominators so we can convert 1/2 to 2/4
7 .
£6.00 = 1/8 of .......
£48.00
£52.00
£56.00
£62.00
Just multiply £6.00 by 8
8 .
How many sixths are there in 323?
12
22
32
42
2/3 is the same as 4/6
9 .
For the calculation 1/4 + 1/2, what would you change 1/2 into in order to find the answer?
3/4
2/4
1/4
4/6
The lowest common multiple is 4, and 2/4 is an equivalent fraction of 1/2
10 .
What is 3/4 - 1/5?
1/20
5/20
11/20
15/20
20 is the lowest common multiple of 4 and 5 so we must convert both fractions to 20ths
You can find more about this topic by visiting BBC Bitesize - Fractions

Author:  Frank Evans (Specialist 11 Plus Teacher and Tutor)

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