Answers

Subtract 18/50 from 20/90

20/90 - 18/50 is -31/225.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 50 is 450
   
   Next, find the equivalent fraction of both fractional numbers with denominator 450
2. For the 1st fraction, since 90 × 5 = 450,
   20/90 = 20 × 5/90 × 5 = 100/450
3. Likewise, for the 2nd fraction, since 50 × 9 = 450,
   18/50 = 18 × 9/50 × 9 = 162/450
4. Subtract the two like fractions:
   100/450 - 162/450 = 100 - 162/450 = -62/450
5. After reducing the fraction, the answer is -31/225

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