Answers

Subtract 49/16 from 81/20

1^st number: 4 1/20, 2^nd number: 3 1/16

81/20 - 49/16 is 79/80.

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,
   81/20 = 81 × 4/20 × 4 = 324/80
3. Likewise, for the 2nd fraction, since 16 × 5 = 80,
   49/16 = 49 × 5/16 × 5 = 245/80
4. Subtract the two like fractions:
   324/80 - 245/80 = 324 - 245/80 = 79/80

MathStep (Works offline)

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

Related: ⁸¹/₂₀-⁹⁸/₁₆ ⁸¹/₄₀-⁴⁹/₁₆ ⁸¹/₂₀-⁴⁹/₃₂ ⁸¹/₆₀-⁴⁹/₁₆ ⁸¹/₂₀-⁴⁹/₄₈ ⁸¹/₂₀-⁴⁹/₈₀

Subtract Fractions Calculator