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It is because that is how "plus" is normally defined.
But 1 plus 1 need not be two. It all depends on the domain and range that you are working with and what you mean by the binary operation "plus".
If 1 means make an about turn, and "plus" means "follow it with", then
1 plus 1 is "make an about turn" and then "make an about turn". If you do that you are back where you started. So in this case, 1 plus 1 is the same as zero.
What else can I help you with?
What 1 plus 1 is?
2 9 1 plus 1 is 2.
What is half plus a half plus a quarter plus three quarters?
1/2 plus 1/2 plus 1/4 plus 3/4 is two.
What is 1 plus 1 in math?
One plus one is Two (1+1=2)
Is half of two plus two equal to two or three?
Since half of 2 is 1 then adding 2 to 1 is 3 (1+2=3) In other words 'Half of two plus two is equal to three.' :) Or if (2+2=4) then 1/2 of 4 is 2
What is the answer fo 1 plus 2?
One plus two equals three. 1 + 2 = 3
1 plus 1 plus 1 plus 1 plus 1?
One plus one is two. It can be expressed mathematically as 1+1 = 2.
What is two thirds plus two fifths?
2/3 + 2/5 = 1 1/15
What is negative two plus one?
-2 + 1 = -1
How much is one plus two?
one plus 2 is 3
What is half plus half plus 2over 3 equals?
1/2 + 1/2 + 2/3 = 1 2/3 or one and two thirds.
What is two minus one minus one plus one minus one plus three minus two plus six?
9A:2 - 1 - 1 + 1 - 1 + 3 - 2 + 6 = 7The answer is seven.
What is one plus two?
One plus two equals 3. According to the Addition Theorem, the bi-equation "1+2" is the same as "1+1+1". And thus we have "1+2=3".
