Answers

Add 21/90 and 4/90

21/90 + 4/90 is 5/18.

Steps for adding fractions

1. Add the two fractions:
   21/90 + 4/90 = 21 + 4/90 = 25/90
2. 25/90 simplified gives 5/18
3. So, 21/90 + 4/90 = 5/18

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