Subtract 21/8 from 84/18
1st number: 4 12/18, 2nd number: 2 5/8
84/18 - 21/8 is 49/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 18 × 4 = 72,
84/18 = 84 × 4/18 × 4 = 336/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
21/8 = 21 × 9/8 × 9 = 189/72 - Subtract the two like fractions:
336/72 - 189/72 = 336 - 189/72 = 147/72 - After reducing the fraction, the answer is 49/24
- In mixed form: 21/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/18-42/8 84/36-21/8 84/18-21/16 84/18-63/8 84/54-21/8 84/18-21/24 84/90-21/8 84/18-21/40 84/18-21/56