Adding and Subtracting Fractions Flashcards

Grade 4 · Math · Flashcards

Key rules and practice for adding and subtracting fractions with the same denominator.

Flashcards

Like fractions rule: Add or subtract the numerators. Keep the denominator exactly the same.
2/5 + 2/5: 4/5
7/9 − 4/9: 3/9 (simplifies to 1/3)
3/8 + 4/8: 7/8
5/6 − 2/6: 3/6 (simplifies to 1/2)
1/4 + 2/4: 3/4
6/7 − 1/7: 5/7
Numerator: The top number in a fraction — how many parts you have.
Denominator: The bottom number in a fraction — the total number of equal parts.
2/10 + 5/10: 7/10
8/12 − 3/12: 5/12
Why doesn't the denominator change when adding like fractions?: Because the size of each piece stays the same — you are just counting more of those same-sized pieces.
4/6 + 2/6: 6/6 = 1 whole