Q 1: Find the missing number: 1 + ? = 1 Answer:

Q 2: Find the missing number: 9 + ? = 9 Answer:

Q 3: Find the missing number: 9 + ? = 18 Answer:

Q 4: Find the missing number: 4 + ? = 7 Answer:

Q 5: Find the missing number: 9 + ? = 12 Answer:

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