Answers

Subtract 25/20 from 1/90

1^st number: 1/90, 2^nd number: 1 5/20

1/90 - 25/20 is -223/180.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 20 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 20 × 9 = 180,
   25/20 = 25 × 9/20 × 9 = 225/180
4. Subtract the two like fractions:
   2/180 - 225/180 = 2 - 225/180 = -223/180

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