Subtract 81/18 from 63/30
1st number: 2 3/30, 2nd number: 4 9/18
63/30 - 81/18 is -12/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
63/30 = 63 × 3/30 × 3 = 189/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
81/18 = 81 × 5/18 × 5 = 405/90 - Subtract the two like fractions:
189/90 - 405/90 = 189 - 405/90 = -216/90 - After reducing the fraction, the answer is -12/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/60-81/18 63/30-81/36 63/90-81/18 63/30-81/54 63/30-81/90