Subtract 28/36 from 45/80
45/80 - 28/36 is -31/144.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 36 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
45/80 = 45 × 9/80 × 9 = 405/720 - Likewise, for the 2nd fraction, since 36 × 20 = 720,
28/36 = 28 × 20/36 × 20 = 560/720 - Subtract the two like fractions:
405/720 - 560/720 = 405 - 560/720 = -155/720 - After reducing the fraction, the answer is -31/144
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