Subtract 9/70 from 72/20
1st number: 3 12/20, 2nd number: 9/70
72/20 - 9/70 is 243/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
72/20 = 72 × 7/20 × 7 = 504/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
9/70 = 9 × 2/70 × 2 = 18/140 - Subtract the two like fractions:
504/140 - 18/140 = 504 - 18/140 = 486/140 - After reducing the fraction, the answer is 243/70
- In mixed form: 333/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20-18/70 72/40-9/70 72/20-27/70 72/60-9/70 72/20-45/70 72/20-63/70