Subtract 10/90 from 72/20
1st number: 3 12/20, 2nd number: 10/90
72/20 - 10/90 is 157/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
72/20 = 72 × 9/20 × 9 = 648/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
10/90 = 10 × 2/90 × 2 = 20/180 - Subtract the two like fractions:
648/180 - 20/180 = 648 - 20/180 = 628/180 - After reducing the fraction, the answer is 157/45
- In mixed form: 322/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/20-20/90 72/40-10/90 72/20-30/90 72/60-10/90 72/20-50/90 72/20-70/90