Subtract 21/18 from 32/30
1st number: 1 2/30, 2nd number: 1 3/18
32/30 - 21/18 is -1/10.
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,
32/30 = 32 × 3/30 × 3 = 96/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
21/18 = 21 × 5/18 × 5 = 105/90 - Subtract the two like fractions:
96/90 - 105/90 = 96 - 105/90 = -9/90 - After reducing the fraction, the answer is -1/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 64/30-21/18 32/30-42/18 32/60-21/18 32/30-21/36 96/30-21/18 32/30-63/18 32/90-21/18 32/30-21/54 32/30-21/90