Answers

Subtract 70/54 from 81/80

1^st number: 1 1/80, 2^nd number: 1 16/54

81/80 - 70/54 is -613/2160.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 80 and 54 is 2160
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2160
2. For the 1st fraction, since 80 × 27 = 2160,
   81/80 = 81 × 27/80 × 27 = 2187/2160
3. Likewise, for the 2nd fraction, since 54 × 40 = 2160,
   70/54 = 70 × 40/54 × 40 = 2800/2160
4. Subtract the two like fractions:
   2187/2160 - 2800/2160 = 2187 - 2800/2160 = -613/2160

MathStep (Works offline)

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

Related:

Subtract Fractions Calculator