Subtract 54/42 from 7/20
1st number: 7/20, 2nd number: 1 12/42
7/20 - 54/42 is -131/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
7/20 = 7 × 21/20 × 21 = 147/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
54/42 = 54 × 10/42 × 10 = 540/420 - Subtract the two like fractions:
147/420 - 540/420 = 147 - 540/420 = -393/420 - After reducing the fraction, the answer is -131/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/20-54/42 7/40-54/42 7/20-54/84 21/20-54/42 7/60-54/42 35/20-54/42 49/20-54/42