Subtract 72/20 from 9/70
1st number: 9/70, 2nd number: 3 12/20
9/70 - 72/20 is -243/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 70 × 2 = 140,
9/70 = 9 × 2/70 × 2 = 18/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
72/20 = 72 × 7/20 × 7 = 504/140 - Subtract the two like fractions:
18/140 - 504/140 = 18 - 504/140 = -486/140 - After reducing the fraction, the answer is -243/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/70-72/20 9/70-72/40 27/70-72/20 9/70-72/60 45/70-72/20 63/70-72/20