Answers

Subtract 90/21 from 3/42

1^st number: 3/42, 2^nd number: 4 6/21

3/42 - 90/21 is -59/14.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 42 and 21 is 42
   
   Next, find the equivalent fraction of both fractional numbers with denominator 42
2. For the 1st fraction, since 42 × 1 = 42,
   3/42 = 3 × 1/42 × 1 = 3/42
3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
   90/21 = 90 × 2/21 × 2 = 180/42
4. Subtract the two like fractions:
   3/42 - 180/42 = 3 - 180/42 = -177/42
5. After reducing the fraction, the answer is -59/14

MathStep (Works offline)

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

Related: ⁶/₄₂-⁹⁰/₂₁ ³/₈₄-⁹⁰/₂₁ ³/₄₂-⁹⁰/₄₂ ⁹/₄₂-⁹⁰/₂₁ ³/₄₂-⁹⁰/₆₃ ¹⁵/₄₂-⁹⁰/₂₁ ²¹/₄₂-⁹⁰/₂₁

Subtract Fractions Calculator