There are a number of times when you need to be able to write one number as a fraction of another (finding percentages in an exam, making juice etc)
Luckily it's really easy to do.
Example 1: Write 25 as a fraction of 35.
The first step here is to write the number as a fraction.
25 
35 
Job done? Not quite, we have to cancel fractions when we can. For this, we need to look for the Highest Common Factor (HCF)
To remind you, the HCF is the biggest number you can divide both the values by. In this case, it's 5.

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Example 2: Write 10 m as a fraction of 30 m
In this one, we have units. In this example, that's not a problem as the units are the same (they will cancel in the fraction)

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Example 3: Write 25 p as a fraction of £3
This one gets a bit more complicated. As the units aren't the same, all we have to do is make them the same.
Write 25 p as a fraction of 300p
Now the units are the same, we can just proceed as we did before,

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