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Add and subtract related fractions in lengths, recipes and equivalent expressions.
Free examples and worked answers. No account needed.
Practise the method.
Add and subtract related fractions in lengths, recipes and equivalent expressions.
Add and subtract related fractions in lengths, recipes and equivalent expressions.
Example 1
Calculate 45−21.
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Answer: 43
- Use the common denominator 4:21=42.
- 45−42=43.
Example 2
A recipe uses 65 cup of oats and 128 cup of seeds. How many cups is this altogether?
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Answer: 23
- Rename 65 as 1210.
- Add equal parts: 1210+128=23 cups.
Example 3
A ribbon is 87m long. Another ribbon is 81m long. What is their combined length in metres?
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Answer: 1
- The parts have the same size, 81m.
- Add the numerators: 87+1=1m.
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