Subtract 70/12 from 21/28
1st number: 21/28, 2nd number: 5 10/12
21/28 - 70/12 is -61/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
21/28 = 21 × 3/28 × 3 = 63/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
70/12 = 70 × 7/12 × 7 = 490/84 - Subtract the two like fractions:
63/84 - 490/84 = 63 - 490/84 = -427/84 - After reducing the fraction, the answer is -61/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28-70/12 21/56-70/12 21/28-70/24 63/28-70/12 21/84-70/12 21/28-70/36 21/28-70/60 21/28-70/84