Subtract 72/12 from 30/45
1st number: 30/45, 2nd number: 6 0/12
30/45 - 72/12 is -16/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
30/45 = 30 × 4/45 × 4 = 120/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
72/12 = 72 × 15/12 × 15 = 1080/180 - Subtract the two like fractions:
120/180 - 1080/180 = 120 - 1080/180 = -960/180 - After reducing the fraction, the answer is -16/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/45-72/12 30/90-72/12 30/45-72/24 90/45-72/12 30/45-72/36 30/45-72/60 30/45-72/84