Grade 6 · Math · Lesson 13

Find Percent of a Quantity

Finding a percent OF a quantity means asking: how big is that share of the whole? "25% of 80" asks for 25 out of every 100 of the 80 marbles, or the dollars in a sale, or the seats in a theater. The percent tells you what fraction of the whole to take, and the quantity tells you the size of the whole. Once you can convert a percent into a decimal or a fraction, finding the part is just a multiplication.

What this lesson teaches

1Find a percent of a whole number by converting the percent to a decimal and multiplying
2Find a percent of a whole number by writing the percent as a fraction over 100 and multiplying
3Use 10% as a benchmark to find 20%, 30%, 50%, and other friendly percents mentally
4Solve real-world problems involving discounts, tips, and savings as percent of a quantity

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