Subtract 90/24 from 90/84
1st number: 1 6/84, 2nd number: 3 18/24
90/84 - 90/24 is -75/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 24 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 84 × 2 = 168,
90/84 = 90 × 2/84 × 2 = 180/168 - Likewise, for the 2nd fraction, since 24 × 7 = 168,
90/24 = 90 × 7/24 × 7 = 630/168 - Subtract the two like fractions:
180/168 - 630/168 = 180 - 630/168 = -450/168 - After reducing the fraction, the answer is -75/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84-90/48 90/84-90/72