Subtract 7/84 from 7/90
7/90 - 7/84 is -1/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 84 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 90 × 14 = 1260,
7/90 = 7 × 14/90 × 14 = 98/1260 - Likewise, for the 2nd fraction, since 84 × 15 = 1260,
7/84 = 7 × 15/84 × 15 = 105/1260 - Subtract the two like fractions:
98/1260 - 105/1260 = 98 - 105/1260 = -7/1260 - After reducing the fraction, the answer is -1/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/90-7/84 7/90-14/84 21/90-7/84 7/90-21/84 35/90-7/84 7/90-35/84 49/90-7/84 7/90-49/84