When you ask "What number is halfway between 11 and 155?" 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=155.
To find the number halfway between 11 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 155 into our formula, we get:
(11 + 155)/2 = 83
Thus, the number halfway between 11 and 155 is 83.
To check that our answer is correct, we subtract 11 from 83 and subtract 83 from 155 and compare the two numbers:
83 - 11 = 72
155 - 83 = 72
As you can see, the halfway number is 72 higher than 11 and 72 lower than 155. Therefore, our halfway between answer of 83 above is correct.
Halfway Between
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Halfway Between 11 and 156
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