Subtract 90/10 from 15/20
1st number: 15/20, 2nd number: 9 0/10
15/20 - 90/10 is -33/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 10 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 20 × 1 = 20,
15/20 = 15 × 1/20 × 1 = 15/20 - Likewise, for the 2nd fraction, since 10 × 2 = 20,
90/10 = 90 × 2/10 × 2 = 180/20 - Subtract the two like fractions:
15/20 - 180/20 = 15 - 180/20 = -165/20 - After reducing the fraction, the answer is -33/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-90/10 15/40-90/10 15/20-90/20 45/20-90/10 15/60-90/10 15/20-90/30 75/20-90/10 15/20-90/50 15/20-90/70