Subtract 48/30 from 21/56
1st number: 21/56, 2nd number: 1 18/30
21/56 - 48/30 is -49/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 30 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 56 × 15 = 840,
21/56 = 21 × 15/56 × 15 = 315/840 - Likewise, for the 2nd fraction, since 30 × 28 = 840,
48/30 = 48 × 28/30 × 28 = 1344/840 - Subtract the two like fractions:
315/840 - 1344/840 = 315 - 1344/840 = -1029/840 - After reducing the fraction, the answer is -49/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-48/30 21/56-96/30 21/56-48/60 63/56-48/30 21/56-48/90