Worked examples
Two examples
Example 1
23 × 45 =
- Multiply the numerators: 2 × 4 = 8.
- Multiply the denominators: 3 × 5 = 15.
Answer: 815
Example 2
34 × 29 =
- Numerators: 3 × 2 = 6. Denominators: 4 × 9 = 36.
- Simplify 636: divide the top and bottom by 6.
Answer: 16
Where this is taught: Quiz 11: Multiplying Fractions, “The rectangle, one last time”
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.