Subtract 72/30 from 3/9
1st number: 3/9, 2nd number: 2 12/30
3/9 - 72/30 is -31/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 9 × 10 = 90,
3/9 = 3 × 10/9 × 10 = 30/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
72/30 = 72 × 3/30 × 3 = 216/90 - Subtract the two like fractions:
30/90 - 216/90 = 30 - 216/90 = -186/90 - After reducing the fraction, the answer is -31/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/9-72/30 3/18-72/30 3/9-72/60 3/27-72/30 3/9-72/90 15/9-72/30 3/45-72/30 21/9-72/30 3/63-72/30