Worked examples
Two examples
Example 1
34 = ?20
- The denominator went from 4 to 20: it was multiplied by 5.
- Multiply the numerator by the same number: 3 × 5 = 15.
Answer: 15
Example 2
23 = 14?
- The numerator went from 2 to 14: it was multiplied by 7.
- Multiply the denominator by the same number: 3 × 7 = 21.
Answer: 21
Where this is taught: Quiz 8: Fractions, “One amount, many names”
The drill
Ten problems
How many:
Type each answer, then press Check my answers at the bottom. Commas in large numbers are fine.Write each answer on the line. The answer key, with the reasoning, is on the last page.