Subtract 21/18 from 8/4
1st number: 2 0/4, 2nd number: 1 3/18
8/4 - 21/18 is 5/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 18 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 4 × 9 = 36,
8/4 = 8 × 9/4 × 9 = 72/36 - Likewise, for the 2nd fraction, since 18 × 2 = 36,
21/18 = 21 × 2/18 × 2 = 42/36 - Subtract the two like fractions:
72/36 - 42/36 = 72 - 42/36 = 30/36 - After reducing the fraction, the answer is 5/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/4-21/18 8/4-42/18 8/4-21/36 24/4-21/18 8/4-63/18 8/12-21/18 8/4-21/54 40/4-21/18 8/20-21/18 8/4-21/90 56/4-21/18 8/28-21/18