Answers

Subtract 81/80 from 1/28

1^st number: 1/28, 2^nd number: 1 1/80

1/28 - 81/80 is -547/560.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 28 and 80 is 560
   
   Next, find the equivalent fraction of both fractional numbers with denominator 560
2. For the 1st fraction, since 28 × 20 = 560,
   1/28 = 1 × 20/28 × 20 = 20/560
3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
   81/80 = 81 × 7/80 × 7 = 567/560
4. Subtract the two like fractions:
   20/560 - 567/560 = 20 - 567/560 = -547/560

MathStep (Works offline)

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

Related: ²/₂₈-⁸¹/₈₀ ¹/₅₆-⁸¹/₈₀ ³/₂₈-⁸¹/₈₀ ¹/₈₄-⁸¹/₈₀ ⁵/₂₈-⁸¹/₈₀ ⁷/₂₈-⁸¹/₈₀

Subtract Fractions Calculator