# ratio and proportion notes

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- Created by: louisepardoe
- Created on: 14-06-16 18:54

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**ratios**

reducing ratios to their simplest form

- divide all the numbers in the ratio by the same thing
- it's in its simplest form when there's nothing left you can divide by

if the ratio contain decimals or fractions- multiply

- with decimals, multiply both sides by a power of 10 to get rid of the decimal parts
- divide to reduce the ratio to its simplest form
- with fractions, put them over a common denominator
- multiply both sides by the denominator
- divide to reduce the ratio to its simplest form

if the ratio has mixed units- convert to the smaller unit

to get the form 1:n or n:1- divide

scaling up ratios

- if you know the ratio between parts and the actual size of one…

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