Subtract 30/8 from 12/90
1st number: 12/90, 2nd number: 3 6/8
12/90 - 30/8 is -217/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 8 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
12/90 = 12 × 4/90 × 4 = 48/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
30/8 = 30 × 45/8 × 45 = 1350/360 - Subtract the two like fractions:
48/360 - 1350/360 = 48 - 1350/360 = -1302/360 - After reducing the fraction, the answer is -217/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/90-30/8 12/90-60/8 12/90-30/16 36/90-30/8 12/90-90/8 12/90-30/24 60/90-30/8 12/90-30/40 84/90-30/8 12/90-30/56