Subtract 18/30 from 21/25
21/25 - 18/30 is 6/25.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 30 is 150
Next, find the equivalent fraction of both fractional numbers with denominator 150 - For the 1st fraction, since 25 × 6 = 150,
21/25 = 21 × 6/25 × 6 = 126/150 - Likewise, for the 2nd fraction, since 30 × 5 = 150,
18/30 = 18 × 5/30 × 5 = 90/150 - Subtract the two like fractions:
126/150 - 90/150 = 126 - 90/150 = 36/150 - After reducing the fraction, the answer is 6/25
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/25-18/30 21/25-36/30 21/50-18/30 21/25-18/60 63/25-18/30 21/25-54/30 21/75-18/30 21/25-18/90 21/25-90/30