Subtract 20/90 from 16/84
16/84 - 20/90 is -2/63.
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,
16/84 = 16 × 15/84 × 15 = 240/1260 - Likewise, for the 2nd fraction, since 90 × 14 = 1260,
20/90 = 20 × 14/90 × 14 = 280/1260 - Subtract the two like fractions:
240/1260 - 280/1260 = 240 - 280/1260 = -40/1260 - After reducing the fraction, the answer is -2/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/84-20/90 16/84-40/90 48/84-20/90 16/84-60/90 80/84-20/90