Subtract 40/90 from 10/20
10/20 - 40/90 is 1/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
10/20 = 10 × 9/20 × 9 = 90/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
40/90 = 40 × 2/90 × 2 = 80/180 - Subtract the two like fractions:
90/180 - 80/180 = 90 - 80/180 = 10/180 - After reducing the fraction, the answer is 1/18
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