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What is a ratio?
- A ratio is used to compare two
or more quantities. The symbol
for ratio is two dots (:).
- For example, 12 red apples compared
to 20 green apples is written as 12 : 20
- To put ratios in their simplest form,
divide both parts of the ratio by the
highest common factor. (HCF)
- For example: 12 : 20 (divide both parts by 4) = 3 : 5
- To express the ratio 3 :
5 in the ratio 1 : n, divide
both sides by 3.
- 3 : 5 =3/3 : 5/3 = 1 : 1 - 2/3
Or 1 : 1.6666....
- 3 : 5 =3/3 : 5/3 = 1 : 1 - 2/3
Or 1 : 1.6666....
- To express the ratio 3 :
5 in the ratio 1 : n, divide
both sides by 3.
- For example: 12 : 20 (divide both parts by 4) = 3 : 5
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