Answers

Subtract 30/16 from 42/20

1^st number: 2 2/20, 2^nd number: 1 14/16

42/20 - 30/16 is 9/40.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 20 and 16 is 80
   
   Next, find the equivalent fraction of both fractional numbers with denominator 80
2. For the 1st fraction, since 20 × 4 = 80,
   42/20 = 42 × 4/20 × 4 = 168/80
3. Likewise, for the 2nd fraction, since 16 × 5 = 80,
   30/16 = 30 × 5/16 × 5 = 150/80
4. Subtract the two like fractions:
   168/80 - 150/80 = 168 - 150/80 = 18/80
5. After reducing the fraction, the answer is 9/40

MathStep (Works offline)

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

Related: ⁸⁴/₂₀-³⁰/₁₆ ⁴²/₂₀-⁶⁰/₁₆ ⁴²/₄₀-³⁰/₁₆ ⁴²/₂₀-³⁰/₃₂ ⁴²/₂₀-⁹⁰/₁₆ ⁴²/₆₀-³⁰/₁₆ ⁴²/₂₀-³⁰/₄₈ ⁴²/₂₀-³⁰/₈₀

Subtract Fractions Calculator