Subtract 3/4 from 15/42
15/42 - 3/4 is -11/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
15/42 = 15 × 2/42 × 2 = 30/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
3/4 = 3 × 21/4 × 21 = 63/84 - Subtract the two like fractions:
30/84 - 63/84 = 30 - 63/84 = -33/84 - After reducing the fraction, the answer is -11/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/42-3/4 15/42-6/4 15/84-3/4 15/42-3/8 45/42-3/4 15/42-9/4 15/42-3/12 75/42-3/4 15/42-15/4 15/42-3/20 15/42-21/4 15/42-3/28