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Fractions
A fraction describes equal parts of a whole: the bottom number says how many parts, the top number how many you have.
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Play in browser Google Play App StoreAdding and subtracting
With the same denominator add the tops: 2/5 + 1/5 = 3/5. With different denominators first make them equal: 1/2 + 1/4 = 2/4 + 1/4 = 3/4.
A fraction of a number
Divide by the bottom, multiply by the top: 3/4 of 20 = 20 ÷ 4 × 3 = 15.
Try it yourself
- 1/2 + 1/4 = ?
- 2/5 + 1/5 = ?
- 2/3 − 1/6 = ?
- 5/6 − 1/2 = ?
- 3/8 + 1/4 = ?
- 1/2 × 1/2 = ?
- 3/4 × 20 = ?
- 1/3 × 12 = ?
Show answers
- 1/2 + 1/4 = 3/4
- 2/5 + 1/5 = 3/5
- 2/3 − 1/6 = 1/2
- 5/6 − 1/2 = 1/3
- 3/8 + 1/4 = 5/8
- 1/2 × 1/2 = 1/4
- 3/4 × 20 = 15
- 1/3 × 12 = 4
Frequently asked questions
Why do I need a common denominator?
You can only add or subtract pieces of the same size.