Subtract 81/72 from 84/20
1st number: 4 4/20, 2nd number: 1 9/72
84/20 - 81/72 is 123/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 72 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 20 × 18 = 360,
84/20 = 84 × 18/20 × 18 = 1512/360 - Likewise, for the 2nd fraction, since 72 × 5 = 360,
81/72 = 81 × 5/72 × 5 = 405/360 - Subtract the two like fractions:
1512/360 - 405/360 = 1512 - 405/360 = 1107/360 - After reducing the fraction, the answer is 123/40
- In mixed form: 33/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/40-81/72 84/60-81/72