Subtract 15/5 from 49/21
1st number: 2 7/21, 2nd number: 3 0/5
49/21 - 15/5 is -2/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
49/21 = 49 × 5/21 × 5 = 245/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
15/5 = 15 × 21/5 × 21 = 315/105 - Subtract the two like fractions:
245/105 - 315/105 = 245 - 315/105 = -70/105 - After reducing the fraction, the answer is -2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 98/21-15/5 49/21-30/5 49/42-15/5 49/21-15/10 49/21-45/5 49/63-15/5 49/21-75/5 49/21-15/25 49/21-15/35