Subtract 90/84 from 54/42
1st number: 1 12/42, 2nd number: 1 6/84
54/42 - 90/84 is 3/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
54/42 = 54 × 2/42 × 2 = 108/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
90/84 = 90 × 1/84 × 1 = 90/84 - Subtract the two like fractions:
108/84 - 90/84 = 108 - 90/84 = 18/84 - After reducing the fraction, the answer is 3/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/84-90/84