Subtract 70/56 from 21/30
1st number: 21/30, 2nd number: 1 14/56
21/30 - 70/56 is -11/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 56 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 30 × 28 = 840,
21/30 = 21 × 28/30 × 28 = 588/840 - Likewise, for the 2nd fraction, since 56 × 15 = 840,
70/56 = 70 × 15/56 × 15 = 1050/840 - Subtract the two like fractions:
588/840 - 1050/840 = 588 - 1050/840 = -462/840 - After reducing the fraction, the answer is -11/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-70/56 21/60-70/56 63/30-70/56 21/90-70/56