Subtract 6/8 from 84/21
1st number: 4 0/21, 2nd number: 6/8
84/21 - 6/8 is 13/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
84/21 = 84 × 8/21 × 8 = 672/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
6/8 = 6 × 21/8 × 21 = 126/168 - Subtract the two like fractions:
672/168 - 126/168 = 672 - 126/168 = 546/168 - After reducing the fraction, the answer is 13/4
- In mixed form: 31/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-12/8 84/42-6/8 84/21-6/16 84/21-18/8 84/63-6/8 84/21-6/24 84/21-30/8 84/21-6/40 84/21-42/8 84/21-6/56