Subtract 40/72 from 15/35
15/35 - 40/72 is -8/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 35 and 72 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 35 × 72 = 2520,
15/35 = 15 × 72/35 × 72 = 1080/2520 - Likewise, for the 2nd fraction, since 72 × 35 = 2520,
40/72 = 40 × 35/72 × 35 = 1400/2520 - Subtract the two like fractions:
1080/2520 - 1400/2520 = 1080 - 1400/2520 = -320/2520 - After reducing the fraction, the answer is -8/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/35-40/72 15/35-80/72 15/70-40/72 45/35-40/72 75/35-40/72