Ratios: find the first quantity
Find what one part is worth, then multiply by the number of parts you need.
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The ratio of fiction books to non-fiction books is 6 : 7. There are 28 non-fiction books. How many fiction books are there?
Answer: 24
The ratio of red marbles to blue marbles is 3 : 1. There are 8 blue marbles. How many red marbles are there?
Answer: 24
The ratio of boys to girls is 4 : 5. There are 30 girls. How many boys are there?
Answer: 24
Tip: Find what one part is worth, then multiply by the number of parts you need.
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- Next in this topic Ratios: find the total Grade 7
- Need a warm-up? Write a ratio from a situation Grade 6
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- Mix It, Pace It: Ratio, Rate and Percent Grades 6–7 · printable lessons
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