Skill: fractions-add-subtract
Add & Subtract Fractions Practice
Like denominators, unlike denominators, improper answers — rename, compute, simplify.
How to enter answers
- Fractions: type
5/6. - Mixed numbers: type
1 1/4(improper fractions like5/4also work). - Always write the answer in simplest form.
Problem types
Like denominators: add
Same pieces, add the tops.
Example: 3/8 + 2/8 = 5/8
Like denominators: subtract
Same pieces, subtract the tops.
Example: 5/6 − 1/6 = 2/3
Unlike: add
Rename with the LCD, then add.
Example: 1/2 + 1/3 = 5/6
Unlike: subtract
Rename with the LCD, then subtract.
Example: 3/4 − 1/3 = 5/12
Improper answers
Convert to a mixed number.
Example: 3/4 + 1/2 = 1 1/4
Word problems
Pizza, ribbon, and measuring cups.
Example: 1/2 + 1/4 pizza = 3/4
Common slip-ups
Adding the denominators
12 + 13 = 2/5 is impossible — the sum must exceed 1/2. Rename first: 5/6.
Renaming only one fraction
After renaming, both denominators must match. Check before touching the numerators.
Leaving the answer unsimplified
6/8 as a final answer is incomplete — finish with 3/4.