Subtract 32/90 from 20/80
20/80 - 32/90 is -19/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
20/80 = 20 × 9/80 × 9 = 180/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
32/90 = 32 × 8/90 × 8 = 256/720 - Subtract the two like fractions:
180/720 - 256/720 = 180 - 256/720 = -76/720 - After reducing the fraction, the answer is -19/180
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