Subtract 30/49 from 9/21
9/21 - 30/49 is -9/49.
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,
9/21 = 9 × 7/21 × 7 = 63/147 - Likewise, for the 2nd fraction, since 49 × 3 = 147,
30/49 = 30 × 3/49 × 3 = 90/147 - Subtract the two like fractions:
63/147 - 90/147 = 63 - 90/147 = -27/147 - After reducing the fraction, the answer is -9/49
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21-30/49 9/21-60/49 9/42-30/49 9/21-30/98 27/21-30/49 9/21-90/49 9/63-30/49 45/21-30/49 63/21-30/49