Subtract 72/10 from 28/40
1st number: 28/40, 2nd number: 7 2/10
28/40 - 72/10 is -13/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 10 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 40 × 1 = 40,
28/40 = 28 × 1/40 × 1 = 28/40 - Likewise, for the 2nd fraction, since 10 × 4 = 40,
72/10 = 72 × 4/10 × 4 = 288/40 - Subtract the two like fractions:
28/40 - 288/40 = 28 - 288/40 = -260/40 - After reducing the fraction, the answer is -13/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40-72/10 28/80-72/10 28/40-72/20 84/40-72/10 28/40-72/30 28/40-72/50 28/40-72/70