Subtract 18/30 from 20/56
20/56 - 18/30 is -17/70.
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,
20/56 = 20 × 15/56 × 15 = 300/840 - Likewise, for the 2nd fraction, since 30 × 28 = 840,
18/30 = 18 × 28/30 × 28 = 504/840 - Subtract the two like fractions:
300/840 - 504/840 = 300 - 504/840 = -204/840 - After reducing the fraction, the answer is -17/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/56-18/30 20/56-36/30 20/56-18/60 60/56-18/30 20/56-54/30 20/56-18/90 20/56-90/30