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Numbers, units and arithmetic
Numbers, units and arithmetic

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3.10 More difficult fraction sums

Sometimes you have to find equivalent factions for all fractions in the sum in order that the denominators are the same.

To add or subtract fractions, use equivalent fractions to make the denominators the same and then add or subtract the numerators.

Example 21

Evaluate one divided by two plus one divided by three.


You cannot change halves to thirds or vice versa, but you can change them both to sixths.

one divided by two equals three divided by six and one divided by three equals two divided by six. So equation sequence part 1 one divided by two plus one divided by three equals part 2 three divided by six plus two divided by six equals part 3 five divided by six full stop.