Worked examples
Two examples
Example 1
38 + 18 =
- Same denominator: add the numerators and keep the denominator: 48.
- Simplify: divide the top and bottom by 4.
Answer: 12
Example 2
79 − 29 =
- Subtract the numerators, keep the denominator.
Answer: 59
Where this is taught: Quiz 10: Adding and Subtracting Fractions, “Same size pieces: add the count, keep the name”
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.