Subtract 54/7 from 18/20
1st number: 18/20, 2nd number: 7 5/7
18/20 - 54/7 is -477/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
18/20 = 18 × 7/20 × 7 = 126/140 - Likewise, for the 2nd fraction, since 7 × 20 = 140,
54/7 = 54 × 20/7 × 20 = 1080/140 - Subtract the two like fractions:
126/140 - 1080/140 = 126 - 1080/140 = -954/140 - After reducing the fraction, the answer is -477/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20-54/7 18/40-54/7 18/20-54/14 54/20-54/7 18/60-54/7 18/20-54/21 90/20-54/7 18/20-54/35 18/20-54/49