Subtract 36/40 from 90/20
1st number: 4 10/20, 2nd number: 36/40
90/20 - 36/40 is 18/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
90/20 = 90 × 2/20 × 2 = 180/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
36/40 = 36 × 1/40 × 1 = 36/40 - Subtract the two like fractions:
180/40 - 36/40 = 180 - 36/40 = 144/40 - After reducing the fraction, the answer is 18/5
- In mixed form: 33/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20-72/40 90/40-36/40 90/20-36/80 90/60-36/40