Subtract 50/21 from 90/5
1st number: 18 0/5, 2nd number: 2 8/21
90/5 - 50/21 is 328/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
90/5 = 90 × 21/5 × 21 = 1890/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
50/21 = 50 × 5/21 × 5 = 250/105 - Subtract the two like fractions:
1890/105 - 250/105 = 1890 - 250/105 = 1640/105 - After reducing the fraction, the answer is 328/21
- In mixed form: 1513/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/10-50/21 90/5-50/42 90/15-50/21 90/5-50/63 90/25-50/21 90/35-50/21