Subtract 18/70 from 1/72
1/72 - 18/70 is -613/2520.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 70 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 72 × 35 = 2520,
1/72 = 1 × 35/72 × 35 = 35/2520 - Likewise, for the 2nd fraction, since 70 × 36 = 2520,
18/70 = 18 × 36/70 × 36 = 648/2520 - Subtract the two like fractions:
35/2520 - 648/2520 = 35 - 648/2520 = -613/2520
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/72-18/70 1/72-36/70 3/72-18/70 1/72-54/70 5/72-18/70 1/72-90/70 7/72-18/70