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.
