Subtract 15/21 from 7/5
1st number: 1 2/5, 2nd number: 15/21
7/5 - 15/21 is 24/35.
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,
7/5 = 7 × 21/5 × 21 = 147/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
15/21 = 15 × 5/21 × 5 = 75/105 - Subtract the two like fractions:
147/105 - 75/105 = 147 - 75/105 = 72/105 - After reducing the fraction, the answer is 24/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/5-15/21 7/5-30/21 7/10-15/21 7/5-15/42 21/5-15/21 7/5-45/21 7/15-15/21 7/5-15/63 35/5-15/21 7/5-75/21 7/25-15/21 49/5-15/21 7/35-15/21