Subtract 81/36 from 28/30
1st number: 28/30, 2nd number: 2 9/36
28/30 - 81/36 is -79/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 36 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 30 × 6 = 180,
28/30 = 28 × 6/30 × 6 = 168/180 - Likewise, for the 2nd fraction, since 36 × 5 = 180,
81/36 = 81 × 5/36 × 5 = 405/180 - Subtract the two like fractions:
168/180 - 405/180 = 168 - 405/180 = -237/180 - After reducing the fraction, the answer is -79/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/30-81/36 28/60-81/36 28/30-81/72 84/30-81/36 28/90-81/36