Subtract 20/4 from 7/42
1st number: 7/42, 2nd number: 5 0/4
7/42 - 20/4 is -29/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
7/42 = 7 × 2/42 × 2 = 14/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
20/4 = 20 × 21/4 × 21 = 420/84 - Subtract the two like fractions:
14/84 - 420/84 = 14 - 420/84 = -406/84 - After reducing the fraction, the answer is -29/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/42-20/4 7/42-40/4 7/84-20/4 7/42-20/8 21/42-20/4 7/42-60/4 7/42-20/12 35/42-20/4 49/42-20/4 7/42-20/28