Subtract 72/6 from 20/42
1st number: 20/42, 2nd number: 12 0/6
20/42 - 72/6 is -242/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 6 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
20/42 = 20 × 1/42 × 1 = 20/42 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
72/6 = 72 × 7/6 × 7 = 504/42 - Subtract the two like fractions:
20/42 - 504/42 = 20 - 504/42 = -484/42 - After reducing the fraction, the answer is -242/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42-72/6 20/84-72/6 20/42-72/12 60/42-72/6 20/42-72/18 20/42-72/30 20/42-72/42