Subtract 25/42 from 4/20
4/20 - 25/42 is -83/210.
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,
4/20 = 4 × 21/20 × 21 = 84/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
25/42 = 25 × 10/42 × 10 = 250/420 - Subtract the two like fractions:
84/420 - 250/420 = 84 - 250/420 = -166/420 - After reducing the fraction, the answer is -83/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/20-25/42 4/20-50/42 4/40-25/42 4/20-25/84 12/20-25/42 4/20-75/42 4/60-25/42 28/20-25/42