Subtract 15/42 from 6/20
6/20 - 15/42 is -2/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
6/20 = 6 × 21/20 × 21 = 126/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
15/42 = 15 × 10/42 × 10 = 150/420 - Subtract the two like fractions:
126/420 - 150/420 = 126 - 150/420 = -24/420 - After reducing the fraction, the answer is -2/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/20-15/42 6/20-30/42 6/40-15/42 6/20-15/84 18/20-15/42 6/20-45/42 6/60-15/42 30/20-15/42 6/20-75/42 42/20-15/42