Subtract 84/63 from 1/42
1st number: 1/42, 2nd number: 1 21/63
1/42 - 84/63 is -55/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 63 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
1/42 = 1 × 3/42 × 3 = 3/126 - Likewise, for the 2nd fraction, since 63 × 2 = 126,
84/63 = 84 × 2/63 × 2 = 168/126 - Subtract the two like fractions:
3/126 - 168/126 = 3 - 168/126 = -165/126 - After reducing the fraction, the answer is -55/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/42-84/63 1/84-84/63 3/42-84/63 5/42-84/63 7/42-84/63