Subtract 30/42 from 2/21
2/21 - 30/42 is -13/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
2/21 = 2 × 2/21 × 2 = 4/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
30/42 = 30 × 1/42 × 1 = 30/42 - Subtract the two like fractions:
4/42 - 30/42 = 4 - 30/42 = -26/42 - After reducing the fraction, the answer is -13/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-30/42 2/21-60/42 2/42-30/42 2/21-30/84 6/21-30/42 2/21-90/42 2/63-30/42 10/21-30/42 14/21-30/42