Subtract 30/81 from 90/63
1st number: 1 27/63, 2nd number: 30/81
90/63 - 30/81 is 200/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 63 × 9 = 567,
90/63 = 90 × 9/63 × 9 = 810/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
30/81 = 30 × 7/81 × 7 = 210/567 - Subtract the two like fractions:
810/567 - 210/567 = 810 - 210/567 = 600/567 - After reducing the fraction, the answer is 200/189
- In mixed form: 111/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/63-60/81 90/63-90/81