Subtract 6/84 from 21/8
1st number: 2 5/8, 2nd number: 6/84
21/8 - 6/84 is 143/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 84 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
21/8 = 21 × 21/8 × 21 = 441/168 - Likewise, for the 2nd fraction, since 84 × 2 = 168,
6/84 = 6 × 2/84 × 2 = 12/168 - Subtract the two like fractions:
441/168 - 12/168 = 441 - 12/168 = 429/168 - After reducing the fraction, the answer is 143/56
- In mixed form: 231/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8-6/84 21/8-12/84 21/16-6/84 63/8-6/84 21/8-18/84 21/24-6/84 21/8-30/84 21/40-6/84 21/8-42/84 21/56-6/84