Subtract 40/72 from 18/35
18/35 - 40/72 is -13/315.
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,
18/35 = 18 × 72/35 × 72 = 1296/2520 - Likewise, for the 2nd fraction, since 72 × 35 = 2520,
40/72 = 40 × 35/72 × 35 = 1400/2520 - Subtract the two like fractions:
1296/2520 - 1400/2520 = 1296 - 1400/2520 = -104/2520 - After reducing the fraction, the answer is -13/315
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/35-40/72 18/35-80/72 18/70-40/72 54/35-40/72 90/35-40/72