Subtract 48/90 from 21/30
21/30 - 48/90 is 1/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
21/30 = 21 × 3/30 × 3 = 63/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
48/90 = 48 × 1/90 × 1 = 48/90 - Subtract the two like fractions:
63/90 - 48/90 = 63 - 48/90 = 15/90 - After reducing the fraction, the answer is 1/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-48/90 21/30-96/90 21/60-48/90 63/30-48/90 21/90-48/90