Answers

Subtract 10/21 from 42/15

1^st number: 2 12/15, 2^nd number: 10/21

42/15 - 10/21 is 244/105.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 21 is 105
   
   Next, find the equivalent fraction of both fractional numbers with denominator 105
2. For the 1st fraction, since 15 × 7 = 105,
   42/15 = 42 × 7/15 × 7 = 294/105
3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
   10/21 = 10 × 5/21 × 5 = 50/105
4. Subtract the two like fractions:
   294/105 - 50/105 = 294 - 50/105 = 244/105
5. In mixed form: 234/105

MathStep (Works offline)

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

Related: ⁸⁴/₁₅-¹⁰/₂₁ ⁴²/₁₅-²⁰/₂₁ ⁴²/₃₀-¹⁰/₂₁ ⁴²/₁₅-¹⁰/₄₂ ⁴²/₁₅-³⁰/₂₁ ⁴²/₄₅-¹⁰/₂₁ ⁴²/₁₅-¹⁰/₆₃ ⁴²/₁₅-⁵⁰/₂₁ ⁴²/₇₅-¹⁰/₂₁ ⁴²/₁₅-⁷⁰/₂₁

Subtract Fractions Calculator