Subtract 1/8 from 21/36
21/36 - 1/8 is 11/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 36 × 2 = 72,
21/36 = 21 × 2/36 × 2 = 42/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
1/8 = 1 × 9/8 × 9 = 9/72 - Subtract the two like fractions:
42/72 - 9/72 = 42 - 9/72 = 33/72 - After reducing the fraction, the answer is 11/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/36-1/8 21/36-2/8 21/72-1/8 21/36-1/16 63/36-1/8 21/36-3/8 21/36-1/24 21/36-5/8 21/36-1/40 21/36-7/8 21/36-1/56