Add:
4
+3


Answer:

7

Step by Step Explanation:
  1. We know that to add 3, we need to take the first addend and count up to 3 digits to obtain the result.
  2. To add 3 to 4, let us begin counting from 4.
    4 + 15 + 16 + 17
  3. We see that by adding 3 to 4 we get 7.
    So,
    4
    +3
    7

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