Subtract 25/21 from 18/15
1st number: 1 3/15, 2nd number: 1 4/21
18/15 - 25/21 is 1/105.
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,
18/15 = 18 × 7/15 × 7 = 126/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
25/21 = 25 × 5/21 × 5 = 125/105 - Subtract the two like fractions:
126/105 - 125/105 = 126 - 125/105 = 1/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15-25/21 18/15-50/21 18/30-25/21 18/15-25/42 54/15-25/21 18/15-75/21 18/45-25/21 18/15-25/63 90/15-25/21 18/75-25/21