Answers

Subtract 18/36 from 1/90

1/90 - 18/36 is -22/45.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 36 is 180
   
   Next, find the equivalent fraction of both fractional numbers with denominator 180
2. For the 1st fraction, since 90 × 2 = 180,
   1/90 = 1 × 2/90 × 2 = 2/180
3. Likewise, for the 2nd fraction, since 36 × 5 = 180,
   18/36 = 18 × 5/36 × 5 = 90/180
4. Subtract the two like fractions:
   2/180 - 90/180 = 2 - 90/180 = -88/180
5. After reducing the fraction, the answer is -22/45

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