Subtract 15/21 from 40/2
1st number: 20 0/2, 2nd number: 15/21
40/2 - 15/21 is 135/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
40/2 = 40 × 21/2 × 21 = 840/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
15/21 = 15 × 2/21 × 2 = 30/42 - Subtract the two like fractions:
840/42 - 30/42 = 840 - 30/42 = 810/42 - After reducing the fraction, the answer is 135/7
- In mixed form: 192/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/2-15/21 40/2-30/21 40/4-15/21 40/2-15/42 40/2-45/21 40/6-15/21 40/2-15/63 40/2-75/21 40/10-15/21 40/14-15/21