Subtract 81/49 from 18/30
1st number: 18/30, 2nd number: 1 32/49
18/30 - 81/49 is -258/245.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 49 is 1470
Next, find the equivalent fraction of both fractional numbers with denominator 1470 - For the 1st fraction, since 30 × 49 = 1470,
18/30 = 18 × 49/30 × 49 = 882/1470 - Likewise, for the 2nd fraction, since 49 × 30 = 1470,
81/49 = 81 × 30/49 × 30 = 2430/1470 - Subtract the two like fractions:
882/1470 - 2430/1470 = 882 - 2430/1470 = -1548/1470 - After reducing the fraction, the answer is -258/245
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/30-81/49 18/60-81/49 18/30-81/98 54/30-81/49 18/90-81/49 90/30-81/49