When you ask "What number is halfway between 11 and 129?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=11 and Y=129.
To find the number halfway between 11 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 129 into our formula, we get:
(11 + 129)/2 = 70
Thus, the number halfway between 11 and 129 is 70.
To check that our answer is correct, we subtract 11 from 70 and subtract 70 from 129 and compare the two numbers:
70 - 11 = 59
129 - 70 = 59
As you can see, the halfway number is 59 higher than 11 and 59 lower than 129. Therefore, our halfway between answer of 70 above is correct.
Halfway Between
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Halfway Between 11 and 130
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