Worked examples
Two examples
Example 1
The ratio of red marbles to blue marbles is 2 : 3. What fraction of the marbles are red?
- Every group has 2 red and 3 blue: 2 + 3 = 5 marbles.
- 2 of every 5 are red.
Answer: 25
Example 2
The ratio of adults to children on a bus is 3 : 5. What fraction of the people are children?
- Every group has 3 + 5 = 8 people.
- 5 of every 8 are children.
Answer: 58
Where this is taught: Ratio, Proportion, and Percent, “Part to part, and part to whole”
The drill
Ten problems
How many:
Type a fraction with a slash, like 3/4, and a mixed number with a space, like 2 1/4. Give answers in simplest form. Then press Check my answers at the bottom.Write each answer on the line, in simplest form. The answer key, with the reasoning, is on the last page.