Subtract 3/21 from 90/15
1st number: 6 0/15, 2nd number: 3/21
90/15 - 3/21 is 41/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
90/15 = 90 × 7/15 × 7 = 630/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
3/21 = 3 × 5/21 × 5 = 15/105 - Subtract the two like fractions:
630/105 - 15/105 = 630 - 15/105 = 615/105 - After reducing the fraction, the answer is 41/7
- In mixed form: 56/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/15-6/21 90/30-3/21 90/15-3/42 90/15-9/21 90/45-3/21 90/15-3/63 90/15-15/21 90/75-3/21