Subtract 12/63 from 90/45
1st number: 2 0/45, 2nd number: 12/63
90/45 - 12/63 is 38/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 63 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
90/45 = 90 × 7/45 × 7 = 630/315 - Likewise, for the 2nd fraction, since 63 × 5 = 315,
12/63 = 12 × 5/63 × 5 = 60/315 - Subtract the two like fractions:
630/315 - 60/315 = 630 - 60/315 = 570/315 - After reducing the fraction, the answer is 38/21
- In mixed form: 117/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/45-24/63 90/45-36/63 90/45-60/63 90/45-84/63