Subtract 50/63 from 81/42
1st number: 1 39/42, 2nd number: 50/63
81/42 - 50/63 is 143/126.
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,
81/42 = 81 × 3/42 × 3 = 243/126 - Likewise, for the 2nd fraction, since 63 × 2 = 126,
50/63 = 50 × 2/63 × 2 = 100/126 - Subtract the two like fractions:
243/126 - 100/126 = 243 - 100/126 = 143/126 - In mixed form: 117/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/84-50/63