Percentages

Treat the reference whole as 100 and connect percentages with ratios to find amounts.

Meaning

A percentage expresses a ratio multiplied by 100 and followed by %. It shows the comparison amount when the reference amount is taken as 100.

Example

If 7 of 20 people wear glasses, or 35%.Scale 20 by 5 to make 100, and scale 7 by the same factor to make 35. Thus or 35%.35% does not mean 35 people. The actual count depends on the reference total.

Practice for this concept

Scope and references

Topics

Representing a reference as 100, meaning of percentages, ratios and percentages

Learning goal

Treat the reference whole as 100 and connect percentages with ratios to find amounts.

Helpful background

Explore part-to-whole ratios using hundredths.

Reading percentages on a 100-cell grid

Does not include finding percentages for varied wholes.

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