Subtract 75/72 from 21/8
1st number: 2 5/8, 2nd number: 1 3/72
21/8 - 75/72 is 19/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
21/8 = 21 × 9/8 × 9 = 189/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
75/72 = 75 × 1/72 × 1 = 75/72 - Subtract the two like fractions:
189/72 - 75/72 = 189 - 75/72 = 114/72 - After reducing the fraction, the answer is 19/12
- In mixed form: 17/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-75/72 21/16-75/72 63/8-75/72 21/24-75/72 21/40-75/72 21/56-75/72