Subtract 36/90 from 7/20
7/20 - 36/90 is -1/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
7/20 = 7 × 9/20 × 9 = 63/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
36/90 = 36 × 2/90 × 2 = 72/180 - Subtract the two like fractions:
63/180 - 72/180 = 63 - 72/180 = -9/180 - After reducing the fraction, the answer is -1/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/20-36/90 7/20-72/90 7/40-36/90 21/20-36/90 7/60-36/90 35/20-36/90 49/20-36/90