Subtract 70/21 from 20/48
1st number: 20/48, 2nd number: 3 7/21
20/48 - 70/21 is -35/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 48 and 21 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 48 × 7 = 336,
20/48 = 20 × 7/48 × 7 = 140/336 - Likewise, for the 2nd fraction, since 21 × 16 = 336,
70/21 = 70 × 16/21 × 16 = 1120/336 - Subtract the two like fractions:
140/336 - 1120/336 = 140 - 1120/336 = -980/336 - After reducing the fraction, the answer is -35/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/48-70/21 20/96-70/21 20/48-70/42 60/48-70/21 20/48-70/63