Subtract 96/72 from 21/70
1st number: 21/70, 2nd number: 1 24/72
21/70 - 96/72 is -31/30.
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,
21/70 = 21 × 36/70 × 36 = 756/2520 - Likewise, for the 2nd fraction, since 72 × 35 = 2520,
96/72 = 96 × 35/72 × 35 = 3360/2520 - Subtract the two like fractions:
756/2520 - 3360/2520 = 756 - 3360/2520 = -2604/2520 - After reducing the fraction, the answer is -31/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70-96/72 63/70-96/72