Subtract 18/72 from 6/90
6/90 - 18/72 is -11/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
6/90 = 6 × 4/90 × 4 = 24/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
18/72 = 18 × 5/72 × 5 = 90/360 - Subtract the two like fractions:
24/360 - 90/360 = 24 - 90/360 = -66/360 - After reducing the fraction, the answer is -11/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/90-18/72 6/90-36/72 18/90-18/72 6/90-54/72 30/90-18/72 6/90-90/72 42/90-18/72