When you ask "What number is halfway between 81 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=81 and Y=155.
To find the number halfway between 81 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 155 into our formula, we get:
(81 + 155)/2 = 118
Thus, the number halfway between 81 and 155 is 118.
To check that our answer is correct, we subtract 81 from 118 and subtract 118 from 155 and compare the two numbers:
118 - 81 = 37
155 - 118 = 37
As you can see, the halfway number is 37 higher than 81 and 37 lower than 155. Therefore, our halfway between answer of 118 above is correct.
Halfway Between
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Halfway Between 81 and 156
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