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What is 1+1?

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What is 1+1?, a selection of answers from the Dr. Math archives.

1 + 1
Does 1 + 1 make 2 or 11?

What is 1 plus 1?
What is 1 plus 1?

One Plus One
Are you sure that 1 plus 1 equals 2?

Proof that 1 + 1 = 1?
Can you shed any light on this subject?

Proof that 1 + 1 = 2
Can you prove that 1 + 1 = 2?

Why 2 + 2 = 4
Why does 2 + 2 = 4?

Sideways Math
Can you solve this problem? One + One = Two.

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Elementary Addition
Index of Selected Answers to Common Questions

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