Subtract 64/30 from 21/90
1st number: 21/90, 2nd number: 2 4/30
21/90 - 64/30 is -19/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
64/30 = 64 × 3/30 × 3 = 192/90 - Subtract the two like fractions:
21/90 - 192/90 = 21 - 192/90 = -171/90 - After reducing the fraction, the answer is -19/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90-64/30 21/90-64/60 63/90-64/30 21/90-64/90