Subtract 81/8 from 30/36
1st number: 30/36, 2nd number: 10 1/8
30/36 - 81/8 is -223/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 36 × 2 = 72,
30/36 = 30 × 2/36 × 2 = 60/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
81/8 = 81 × 9/8 × 9 = 729/72 - Subtract the two like fractions:
60/72 - 729/72 = 60 - 729/72 = -669/72 - After reducing the fraction, the answer is -223/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/36-81/8 30/72-81/8 30/36-81/16 90/36-81/8 30/36-81/24 30/36-81/40 30/36-81/56