Subtract 3/4 from 10/42
10/42 - 3/4 is -43/84.
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,
10/42 = 10 × 2/42 × 2 = 20/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
3/4 = 3 × 21/4 × 21 = 63/84 - Subtract the two like fractions:
20/84 - 63/84 = 20 - 63/84 = -43/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/42-3/4 10/42-6/4 10/84-3/4 10/42-3/8 30/42-3/4 10/42-9/4 10/42-3/12 50/42-3/4 10/42-15/4 10/42-3/20 70/42-3/4 10/42-21/4 10/42-3/28