Subtract 80/90 from 21/48
21/48 - 80/90 is -65/144.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 48 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 48 × 15 = 720,
21/48 = 21 × 15/48 × 15 = 315/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
80/90 = 80 × 8/90 × 8 = 640/720 - Subtract the two like fractions:
315/720 - 640/720 = 315 - 640/720 = -325/720 - After reducing the fraction, the answer is -65/144
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