Subtract 20/21 from 70/96
70/96 - 20/21 is -25/112.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 96 and 21 is 672
Next, find the equivalent fraction of both fractional numbers with denominator 672 - For the 1st fraction, since 96 × 7 = 672,
70/96 = 70 × 7/96 × 7 = 490/672 - Likewise, for the 2nd fraction, since 21 × 32 = 672,
20/21 = 20 × 32/21 × 32 = 640/672 - Subtract the two like fractions:
490/672 - 640/672 = 490 - 640/672 = -150/672 - After reducing the fraction, the answer is -25/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/96-40/21 70/96-20/42 70/96-60/21 70/96-20/63