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Other Important <strong>Math</strong> Concepts<br />
Proportions<br />
A proportion is a statement that two ratios are equal. This is how it is shown:<br />
or 15:10 = 3:2<br />
It is read: “ fifteen is to ten as three is to two”. If proportions are equal, crossmultiply<br />
and the answer should be the same. 15 x 2 = 10 x 3<br />
Cross-multiplication can be used to find an unknown number in a proportion.<br />
For example: 5 is to 10 as 20 is to an unknown number.<br />
1. Write the proportion, letting “a” stand for the unknown number.<br />
2. Cross-multiply. 5 X a = 10 x 20<br />
5a = 200<br />
a = 200 ÷ 5<br />
a = 40<br />
76 76<br />
<strong>Simply</strong> <strong>Math</strong> Workbook<br />
NWT Literacy Council
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