Subtract 72/45 from 12/90
1st number: 12/90, 2nd number: 1 27/45
12/90 - 72/45 is -22/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
12/90 = 12 × 1/90 × 1 = 12/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
72/45 = 72 × 2/45 × 2 = 144/90 - Subtract the two like fractions:
12/90 - 144/90 = 12 - 144/90 = -132/90 - After reducing the fraction, the answer is -22/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/90-72/45 12/90-72/90 36/90-72/45 60/90-72/45 84/90-72/45