Subtract 15/70 from 18/72
18/72 - 15/70 is 1/28.
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,
18/72 = 18 × 35/72 × 35 = 630/2520 - Likewise, for the 2nd fraction, since 70 × 36 = 2520,
15/70 = 15 × 36/70 × 36 = 540/2520 - Subtract the two like fractions:
630/2520 - 540/2520 = 630 - 540/2520 = 90/2520 - After reducing the fraction, the answer is 1/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/72-15/70 18/72-30/70 54/72-15/70 18/72-45/70 90/72-15/70 18/72-75/70