Subtract 49/21 from 45/70
1st number: 45/70, 2nd number: 2 7/21
45/70 - 49/21 is -71/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
45/70 = 45 × 3/70 × 3 = 135/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
49/21 = 49 × 10/21 × 10 = 490/210 - Subtract the two like fractions:
135/210 - 490/210 = 135 - 490/210 = -355/210 - After reducing the fraction, the answer is -71/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/70-49/21 45/70-98/21 45/70-49/42 45/70-49/63