Subtract 15/9 from 18/7
1st number: 2 4/7, 2nd number: 1 6/9
18/7 - 15/9 is 19/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 7 × 9 = 63,
18/7 = 18 × 9/7 × 9 = 162/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
15/9 = 15 × 7/9 × 7 = 105/63 - Subtract the two like fractions:
162/63 - 105/63 = 162 - 105/63 = 57/63 - After reducing the fraction, the answer is 19/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/7-15/9 18/7-30/9 18/14-15/9 18/7-15/18 54/7-15/9 18/7-45/9 18/21-15/9 18/7-15/27 90/7-15/9 18/7-75/9 18/35-15/9 18/7-15/45 18/49-15/9 18/7-15/63