Subtract 18/70 from 28/72
28/72 - 18/70 is 83/630.
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,
28/72 = 28 × 35/72 × 35 = 980/2520 - Likewise, for the 2nd fraction, since 70 × 36 = 2520,
18/70 = 18 × 36/70 × 36 = 648/2520 - Subtract the two like fractions:
980/2520 - 648/2520 = 980 - 648/2520 = 332/2520 - After reducing the fraction, the answer is 83/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/72-18/70 28/72-36/70 84/72-18/70 28/72-54/70 28/72-90/70