Subtract 18/49 from 18/21
18/21 - 18/49 is 24/49.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 49 is 147
Next, find the equivalent fraction of both fractional numbers with denominator 147 - For the 1st fraction, since 21 × 7 = 147,
18/21 = 18 × 7/21 × 7 = 126/147 - Likewise, for the 2nd fraction, since 49 × 3 = 147,
18/49 = 18 × 3/49 × 3 = 54/147 - Subtract the two like fractions:
126/147 - 54/147 = 126 - 54/147 = 72/147 - After reducing the fraction, the answer is 24/49
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21-18/49 18/21-36/49 18/42-18/49 18/21-18/98 54/21-18/49 18/21-54/49 18/63-18/49 90/21-18/49 18/21-90/49