Subtract 90/8 from 12/28
1st number: 12/28, 2nd number: 11 2/8
12/28 - 90/8 is -303/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 8 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 28 × 2 = 56,
12/28 = 12 × 2/28 × 2 = 24/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
90/8 = 90 × 7/8 × 7 = 630/56 - Subtract the two like fractions:
24/56 - 630/56 = 24 - 630/56 = -606/56 - After reducing the fraction, the answer is -303/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/28-90/8 12/56-90/8 12/28-90/16 36/28-90/8 12/84-90/8 12/28-90/24 60/28-90/8 12/28-90/40 84/28-90/8 12/28-90/56