Subtract 72/20 from 45/49
1st number: 45/49, 2nd number: 3 12/20
45/49 - 72/20 is -657/245.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 20 is 980
Next, find the equivalent fraction of both fractional numbers with denominator 980 - For the 1st fraction, since 49 × 20 = 980,
45/49 = 45 × 20/49 × 20 = 900/980 - Likewise, for the 2nd fraction, since 20 × 49 = 980,
72/20 = 72 × 49/20 × 49 = 3528/980 - Subtract the two like fractions:
900/980 - 3528/980 = 900 - 3528/980 = -2628/980 - After reducing the fraction, the answer is -657/245
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/49-72/20 45/98-72/20 45/49-72/40 45/49-72/60