Grade 4 Mathematics
When fractions have the SAME denominator (like denominators), we can add or subtract them easily!
Add or subtract the NUMERATORS (top numbers).
Keep the DENOMINATOR the same (bottom number).
Then simplify if you can!
28 + 38 = ?
Check: Are the denominators the same? YES! Both are 8ths.
Add the numerators: 2 + 3 = 5
Keep the denominator: 8
56 - 26 = ?
Subtract the numerators: 5 - 2 = 3
Keep the denominator: 6
Simplify! 3/6 = 1/2 (divide both by 3)
WRONG: 1/4 + 2/4 = 3/8 (Don't add 4 + 4!)
RIGHT: 1/4 + 2/4 = 3/4 (Only add the numerators: 1 + 2 = 3. The denominator stays 4!)
215 + 135 = ?
Add the whole numbers: 2 + 1 = 3
Add the fractions: 1/5 + 3/5 = 4/5
Combine: 3 + 4/5 = 3 4/5
1. Add the fractions.
2. Subtract the fractions. Simplify your answer.
3. Add the mixed numbers.
4. Word Problem: Jenna drank 2/5 of a bottle of water. Later, she drank another 2/5. What fraction of the bottle did she drink in all?
Equation:
Answer: of the bottle