Subtract 50/90 from 40/84
40/84 - 50/90 is -5/63.
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,
40/84 = 40 × 15/84 × 15 = 600/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
50/90 = 50 × 14/90 × 14 = 700/1260 - Subtract the two like fractions:
600/1260 - 700/1260 = 600 - 700/1260 = -100/1260 - After reducing the fraction, the answer is -5/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84-50/90