Subtract 84/3 from 20/42
1st number: 20/42, 2nd number: 28 0/3
20/42 - 84/3 is -578/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 3 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 3 × 14 = 42,
84/3 = 84 × 14/3 × 14 = 1176/42 - Subtract the two like fractions:
20/42 - 1176/42 = 20 - 1176/42 = -1156/42 - After reducing the fraction, the answer is -578/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42-84/3 20/84-84/3 20/42-84/6 60/42-84/3 20/42-84/9 20/42-84/15 20/42-84/21