KS3 Fractions
Key skills:
• Simplifying fractions
• Adding and subtracting fractions
• Multiplying fractions
• Dividing fractions
• Fractions decimals and percentages
Quick skills check!
1) What method can we use to add and subtract fractions?
2) How do we divide fractions? What trick do we use?
2 1
3) +5=
3
3 3
4) ×4=
10
5 3
5) ÷4 =
8
Adding fractions
3 1
1) 10 + =
5
1 2
2) 12 + =
3
1 3
3) 6 + =
4
1 3
4) 6 + =
4
Subtracting fractions
Subtracting fractions
- This is a simple step on from adding fractions. We have the same goal of making the
denominator the same for both fractions, just as we did when adding.
- When the bottom is the same, we can simply subtract the top numbers as we would
with normal numbers
Example:
7 1 7 3 4 1
1) 12 − 4 = 12 − 12 = 12 = 3
3 1
1) 10 − =
5
1 2
2) 12 − =
3
1 3
3) 6 − =
4
1 3
4) 6 − =
4
Multiplying fractions
- you can easily apply your times tables skills here!
- the main thing to remember when multiplying fractions is that you multiply top x top and
bottom x bottom
- The result of this might not be in its simplest form, so we then just need to simplify it,
which we’re already good at!
Dividing fractions
- We are now just using multiplication skills with an added twist!
- When you divide, you need to flip the second fraction upside down and multiply just
as you did before. This is simply just the method we use!
Fractions, decimals and percentages
