Subtract 10/8 from 30/90
1st number: 30/90, 2nd number: 1 2/8
30/90 - 10/8 is -11/12.
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,
30/90 = 30 × 4/90 × 4 = 120/360 - Likewise, for the 2nd fraction, since 8 × 45 = 360,
10/8 = 10 × 45/8 × 45 = 450/360 - Subtract the two like fractions:
120/360 - 450/360 = 120 - 450/360 = -330/360 - After reducing the fraction, the answer is -11/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/90-10/8 30/90-20/8 30/90-10/16 30/90-30/8 30/90-10/24 30/90-50/8 30/90-10/40 30/90-70/8 30/90-10/56