Subtract 12/90 from 12/28
12/28 - 12/90 is 31/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 28 × 45 = 1260,
12/28 = 12 × 45/28 × 45 = 540/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
12/90 = 12 × 14/90 × 14 = 168/1260 - Subtract the two like fractions:
540/1260 - 168/1260 = 540 - 168/1260 = 372/1260 - After reducing the fraction, the answer is 31/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/28-12/90 12/28-24/90 12/56-12/90 36/28-12/90 12/28-36/90 12/84-12/90 60/28-12/90 12/28-60/90 84/28-12/90 12/28-84/90