Subtract 28/72 from 5/70
5/70 - 28/72 is -20/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 72 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 70 × 36 = 2520,
5/70 = 5 × 36/70 × 36 = 180/2520 - Likewise, for the 2nd fraction, since 72 × 35 = 2520,
28/72 = 28 × 35/72 × 35 = 980/2520 - Subtract the two like fractions:
180/2520 - 980/2520 = 180 - 980/2520 = -800/2520 - After reducing the fraction, the answer is -20/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/70-28/72 5/70-56/72 15/70-28/72 5/70-84/72 25/70-28/72 35/70-28/72