Subtract 81/72 from 7/70
1st number: 7/70, 2nd number: 1 9/72
7/70 - 81/72 is -41/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 72 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 70 × 36 = 2520,
7/70 = 7 × 36/70 × 36 = 252/2520 - Likewise, for the 2nd fraction, since 72 × 35 = 2520,
81/72 = 81 × 35/72 × 35 = 2835/2520 - Subtract the two like fractions:
252/2520 - 2835/2520 = 252 - 2835/2520 = -2583/2520 - After reducing the fraction, the answer is -41/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/70-81/72 21/70-81/72 35/70-81/72 49/70-81/72