Subtract 20/50 from 2/90
2/90 - 20/50 is -17/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 50 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 90 × 5 = 450,
2/90 = 2 × 5/90 × 5 = 10/450 - Likewise, for the 2nd fraction, since 50 × 9 = 450,
20/50 = 20 × 9/50 × 9 = 180/450 - Subtract the two like fractions:
10/450 - 180/450 = 10 - 180/450 = -170/450 - After reducing the fraction, the answer is -17/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/90-20/50 2/90-40/50 6/90-20/50 2/90-60/50 10/90-20/50 14/90-20/50