When you ask "What number is halfway between 81 and 162?" 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=162.
To find the number halfway between 81 and 162, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 162 into our formula, we get:
(81 + 162)/2 = 121.5
Thus, the number halfway between 81 and 162 is 121.5.
To check that our answer is correct, we subtract 81 from 121.5 and subtract 121.5 from 162 and compare the two numbers:
121.5 - 81 = 40.5
162 - 121.5 = 40.5
As you can see, the halfway number is 40.5 higher than 81 and 40.5 lower than 162. Therefore, our halfway between answer of 121.5 above is correct.
Halfway Between
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Halfway Between 81 and 163
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