Subtract 9/72 from 3/70
3/70 - 9/72 is -23/280.
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,
3/70 = 3 × 36/70 × 36 = 108/2520 - Likewise, for the 2nd fraction, since 72 × 35 = 2520,
9/72 = 9 × 35/72 × 35 = 315/2520 - Subtract the two like fractions:
108/2520 - 315/2520 = 108 - 315/2520 = -207/2520 - After reducing the fraction, the answer is -23/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/70-9/72 3/70-18/72 9/70-9/72 3/70-27/72 15/70-9/72 3/70-45/72 21/70-9/72 3/70-63/72