Subtract 63/21 from 18/36
1st number: 18/36, 2nd number: 3 0/21
18/36 - 63/21 is -5/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 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 21 × 12 = 252,
63/21 = 63 × 12/21 × 12 = 756/252 - Subtract the two like fractions:
126/252 - 756/252 = 126 - 756/252 = -630/252 - After reducing the fraction, the answer is -5/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/72-63/21 18/36-63/42 54/36-63/21 90/36-63/21