Subtract 50/63 from 30/81
30/81 - 50/63 is -80/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 63 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
30/81 = 30 × 7/81 × 7 = 210/567 - Likewise, for the 2nd fraction, since 63 × 9 = 567,
50/63 = 50 × 9/63 × 9 = 450/567 - Subtract the two like fractions:
210/567 - 450/567 = 210 - 450/567 = -240/567 - After reducing the fraction, the answer is -80/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/81-50/63 90/81-50/63