Subtract 42/21 from 10/36
1st number: 10/36, 2nd number: 2 0/21
10/36 - 42/21 is -31/18.
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,
10/36 = 10 × 7/36 × 7 = 70/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
42/21 = 42 × 12/21 × 12 = 504/252 - Subtract the two like fractions:
70/252 - 504/252 = 70 - 504/252 = -434/252 - After reducing the fraction, the answer is -31/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/36-42/21 10/36-84/21 10/72-42/21 30/36-42/21 10/36-42/63 50/36-42/21 70/36-42/21