Worked examples
Two examples
Example 1
Is 4 : 6 equal to 10 : 15?
- Cross-multiply: 4 × 15 = 60, and 6 × 10 = 60.
- The products are equal.
Answer: Yes
Example 2
Is 3 : 5 equal to 9 : 16?
- Cross-multiply: 3 × 16 = 48, and 5 × 9 = 45.
- The products are different.
Answer: No
Where this is taught: Ratio, Proportion, and Percent, “Telling whether two ratios are equal”
The drill
Ten problems
How many:
Tap your answer to each one, then press Check my answers at the bottom.Circle your answer to each one. The answer key, with the reasoning, is on the last page.