Subtract 1/21 from 90/8
1st number: 11 2/8, 2nd number: 1/21
90/8 - 1/21 is 941/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
90/8 = 90 × 21/8 × 21 = 1890/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
1/21 = 1 × 8/21 × 8 = 8/168 - Subtract the two like fractions:
1890/168 - 8/168 = 1890 - 8/168 = 1882/168 - After reducing the fraction, the answer is 941/84
- In mixed form: 1117/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/8-2/21 90/16-1/21 90/8-1/42 90/8-3/21 90/24-1/21 90/8-1/63 90/8-5/21 90/40-1/21 90/8-7/21 90/56-1/21