Subtract 12/90 from 7/8
7/8 - 12/90 is 89/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 8 × 45 = 360,
7/8 = 7 × 45/8 × 45 = 315/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
12/90 = 12 × 4/90 × 4 = 48/360 - Subtract the two like fractions:
315/360 - 48/360 = 315 - 48/360 = 267/360 - After reducing the fraction, the answer is 89/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/8-12/90 7/8-24/90 7/16-12/90 21/8-12/90 7/8-36/90 7/24-12/90 35/8-12/90 7/8-60/90 7/40-12/90 49/8-12/90 7/8-84/90 7/56-12/90