Subtract 81/72 from 7/4
1st number: 1 3/4, 2nd number: 1 9/72
7/4 - 81/72 is 5/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 4 × 18 = 72,
7/4 = 7 × 18/4 × 18 = 126/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
81/72 = 81 × 1/72 × 1 = 81/72 - Subtract the two like fractions:
126/72 - 81/72 = 126 - 81/72 = 45/72 - After reducing the fraction, the answer is 5/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/4-81/72 7/8-81/72 21/4-81/72 7/12-81/72 35/4-81/72 7/20-81/72 49/4-81/72 7/28-81/72