Subtract 1/21 from 45/15
1st number: 3 0/15, 2nd number: 1/21
45/15 - 1/21 is 62/21.
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,
45/15 = 45 × 7/15 × 7 = 315/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
1/21 = 1 × 5/21 × 5 = 5/105 - Subtract the two like fractions:
315/105 - 5/105 = 315 - 5/105 = 310/105 - After reducing the fraction, the answer is 62/21
- In mixed form: 220/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/15-1/21 45/15-2/21 45/30-1/21 45/15-1/42 45/15-3/21 45/15-1/63 45/15-5/21 45/75-1/21 45/15-7/21