Answers

Subtract 40/28 from 30/21

1^st number: 1 9/21, 2^nd number: 1 12/28

30/21 - 40/28 is 0/1.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 28 is 84
2. For the 1st fraction, since 21 × 4 = 84,
   30/21 = 30 × 4/21 × 4 = 120/84
3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
   40/28 = 40 × 3/28 × 3 = 120/84
4. Subtract the two fractions:
   120/84 - 120/84 = 120 - 120/84 = 0/84
5. The answer is 0

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ⁶⁰/₂₁-⁴⁰/₂₈ ³⁰/₂₁-⁸⁰/₂₈ ³⁰/₄₂-⁴⁰/₂₈ ³⁰/₂₁-⁴⁰/₅₆ ⁹⁰/₂₁-⁴⁰/₂₈ ³⁰/₆₃-⁴⁰/₂₈ ³⁰/₂₁-⁴⁰/₈₄

Subtract Fractions Calculator