Subtract 63/7 from 20/40
1st number: 20/40, 2nd number: 9 0/7
20/40 - 63/7 is -17/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 7 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
20/40 = 20 × 7/40 × 7 = 140/280 - Likewise, for the 2nd fraction, since 7 × 40 = 280,
63/7 = 63 × 40/7 × 40 = 2520/280 - Subtract the two like fractions:
140/280 - 2520/280 = 140 - 2520/280 = -2380/280 - After reducing the fraction, the answer is -17/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/80-63/7 20/40-63/14 60/40-63/7 20/40-63/21 20/40-63/35 20/40-63/49