Subtract 36/21 from 18/24
1st number: 18/24, 2nd number: 1 15/21
18/24 - 36/21 is -27/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
18/24 = 18 × 7/24 × 7 = 126/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
36/21 = 36 × 8/21 × 8 = 288/168 - Subtract the two like fractions:
126/168 - 288/168 = 126 - 288/168 = -162/168 - After reducing the fraction, the answer is -27/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/24-36/21 18/24-72/21 18/48-36/21 18/24-36/42 54/24-36/21 18/72-36/21 18/24-36/63 90/24-36/21