Subtract 10/36 from 21/84
21/84 - 10/36 is -1/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
21/84 = 21 × 3/84 × 3 = 63/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
10/36 = 10 × 7/36 × 7 = 70/252 - Subtract the two like fractions:
63/252 - 70/252 = 63 - 70/252 = -7/252 - After reducing the fraction, the answer is -1/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84-10/36 21/84-20/36 21/84-10/72 63/84-10/36 21/84-30/36 21/84-50/36 21/84-70/36