Subtract 84/7 from 21/8
1st number: 2 5/8, 2nd number: 12 0/7
21/8 - 84/7 is -75/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 7 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 8 × 7 = 56,
21/8 = 21 × 7/8 × 7 = 147/56 - Likewise, for the 2nd fraction, since 7 × 8 = 56,
84/7 = 84 × 8/7 × 8 = 672/56 - Subtract the two like fractions:
147/56 - 672/56 = 147 - 672/56 = -525/56 - After reducing the fraction, the answer is -75/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-84/7 21/16-84/7 21/8-84/14 63/8-84/7 21/24-84/7 21/8-84/21 21/40-84/7 21/8-84/35 21/56-84/7 21/8-84/49