Subtract 80/18 from 81/63
1st number: 1 18/63, 2nd number: 4 8/18
81/63 - 80/18 is -199/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 63 × 2 = 126,
81/63 = 81 × 2/63 × 2 = 162/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
80/18 = 80 × 7/18 × 7 = 560/126 - Subtract the two like fractions:
162/126 - 560/126 = 162 - 560/126 = -398/126 - After reducing the fraction, the answer is -199/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/63-80/36 81/63-80/54 81/63-80/90