Subtract 63/7 from 12/90
1st number: 12/90, 2nd number: 9 0/7
12/90 - 63/7 is -133/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 7 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
12/90 = 12 × 7/90 × 7 = 84/630 - Likewise, for the 2nd fraction, since 7 × 90 = 630,
63/7 = 63 × 90/7 × 90 = 5670/630 - Subtract the two like fractions:
84/630 - 5670/630 = 84 - 5670/630 = -5586/630 - After reducing the fraction, the answer is -133/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/90-63/7 12/90-63/14 36/90-63/7 12/90-63/21 60/90-63/7 12/90-63/35 84/90-63/7 12/90-63/49