Subtract 72/20 from 36/70
1st number: 36/70, 2nd number: 3 12/20
36/70 - 72/20 is -108/35.
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,
36/70 = 36 × 2/70 × 2 = 72/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
72/20 = 72 × 7/20 × 7 = 504/140 - Subtract the two like fractions:
72/140 - 504/140 = 72 - 504/140 = -432/140 - After reducing the fraction, the answer is -108/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/70-72/20 36/70-72/40 36/70-72/60