Subtract 45/90 from 3/84
3/84 - 45/90 is -13/28.
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,
45/90 = 45 × 14/90 × 14 = 630/1260 - Subtract the two like fractions:
45/1260 - 630/1260 = 45 - 630/1260 = -585/1260 - After reducing the fraction, the answer is -13/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/84-45/90 9/84-45/90 15/84-45/90 21/84-45/90