Subtract 28/16 from 70/21
1st number: 3 7/21, 2nd number: 1 12/16
70/21 - 28/16 is 19/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 16 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 21 × 16 = 336,
70/21 = 70 × 16/21 × 16 = 1120/336 - Likewise, for the 2nd fraction, since 16 × 21 = 336,
28/16 = 28 × 21/16 × 21 = 588/336 - Subtract the two like fractions:
1120/336 - 588/336 = 1120 - 588/336 = 532/336 - After reducing the fraction, the answer is 19/12
- In mixed form: 17/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21-56/16 70/42-28/16 70/21-28/32 70/21-84/16 70/63-28/16 70/21-28/48 70/21-28/80