Subtract 45/7 from 12/90
1st number: 12/90, 2nd number: 6 3/7
12/90 - 45/7 is -661/105.
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,
45/7 = 45 × 90/7 × 90 = 4050/630 - Subtract the two like fractions:
84/630 - 4050/630 = 84 - 4050/630 = -3966/630 - After reducing the fraction, the answer is -661/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/90-45/7 12/90-90/7 12/90-45/14 36/90-45/7 12/90-45/21 60/90-45/7 12/90-45/35 84/90-45/7 12/90-45/49