Subtract 25/81 from 9/72
9/72 - 25/81 is -119/648.
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,
9/72 = 9 × 9/72 × 9 = 81/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
25/81 = 25 × 8/81 × 8 = 200/648 - Subtract the two like fractions:
81/648 - 200/648 = 81 - 200/648 = -119/648
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/72-25/81 9/72-50/81 27/72-25/81 9/72-75/81 45/72-25/81 63/72-25/81