Subtract 50/81 from 3/72
3/72 - 50/81 is -373/648.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 81 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 72 × 9 = 648,
3/72 = 3 × 9/72 × 9 = 27/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
50/81 = 50 × 8/81 × 8 = 400/648 - Subtract the two like fractions:
27/648 - 400/648 = 27 - 400/648 = -373/648
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/72-50/81 9/72-50/81 15/72-50/81 21/72-50/81