Subtract 9/4 from 70/81
1st number: 70/81, 2nd number: 2 1/4
70/81 - 9/4 is -449/324.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 4 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 81 × 4 = 324,
70/81 = 70 × 4/81 × 4 = 280/324 - Likewise, for the 2nd fraction, since 4 × 81 = 324,
9/4 = 9 × 81/4 × 81 = 729/324 - Subtract the two like fractions:
280/324 - 729/324 = 280 - 729/324 = -449/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/81-18/4 70/81-9/8 70/81-27/4 70/81-9/12 70/81-45/4 70/81-9/20 70/81-63/4 70/81-9/28