Answers

Subtract 90/18 from 20/25

1^st number: 20/25, 2^nd number: 5 0/18

20/25 - 90/18 is -21/5.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 25 and 18 is 450
   
   Next, find the equivalent fraction of both fractional numbers with denominator 450
2. For the 1st fraction, since 25 × 18 = 450,
   20/25 = 20 × 18/25 × 18 = 360/450
3. Likewise, for the 2nd fraction, since 18 × 25 = 450,
   90/18 = 90 × 25/18 × 25 = 2250/450
4. Subtract the two like fractions:
   360/450 - 2250/450 = 360 - 2250/450 = -1890/450
5. After reducing the fraction, the answer is -21/5

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