Subtract 24/30 from 21/56
21/56 - 24/30 is -17/40.
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,
24/30 = 24 × 28/30 × 28 = 672/840 - Subtract the two like fractions:
315/840 - 672/840 = 315 - 672/840 = -357/840 - After reducing the fraction, the answer is -17/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-24/30 21/56-48/30 21/56-24/60 63/56-24/30 21/56-72/30 21/56-24/90