Subtract 30/7 from 63/81
1st number: 63/81, 2nd number: 4 2/7
63/81 - 30/7 is -221/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 7 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
63/81 = 63 × 7/81 × 7 = 441/567 - Likewise, for the 2nd fraction, since 7 × 81 = 567,
30/7 = 30 × 81/7 × 81 = 2430/567 - Subtract the two like fractions:
441/567 - 2430/567 = 441 - 2430/567 = -1989/567 - After reducing the fraction, the answer is -221/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/81-60/7 63/81-30/14 63/81-90/7 63/81-30/21 63/81-30/35 63/81-30/49