Subtract 30/90 from 3/84
3/84 - 30/90 is -25/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 90 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 84 × 15 = 1260,
3/84 = 3 × 15/84 × 15 = 45/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
30/90 = 30 × 14/90 × 14 = 420/1260 - Subtract the two like fractions:
45/1260 - 420/1260 = 45 - 420/1260 = -375/1260 - After reducing the fraction, the answer is -25/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/84-30/90 3/84-60/90 9/84-30/90 15/84-30/90 21/84-30/90