Subtract 90/63 from 18/36
1st number: 18/36, 2nd number: 1 27/63
18/36 - 90/63 is -13/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 63 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
18/36 = 18 × 7/36 × 7 = 126/252 - Likewise, for the 2nd fraction, since 63 × 4 = 252,
90/63 = 90 × 4/63 × 4 = 360/252 - Subtract the two like fractions:
126/252 - 360/252 = 126 - 360/252 = -234/252 - After reducing the fraction, the answer is -13/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/72-90/63 54/36-90/63 90/36-90/63