When you ask "What number is halfway between 81 and 236?" 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=236.
To find the number halfway between 81 and 236, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 236 into our formula, we get:
(81 + 236)/2 = 158.5
Thus, the number halfway between 81 and 236 is 158.5.
To check that our answer is correct, we subtract 81 from 158.5 and subtract 158.5 from 236 and compare the two numbers:
158.5 - 81 = 77.5
236 - 158.5 = 77.5
As you can see, the halfway number is 77.5 higher than 81 and 77.5 lower than 236. Therefore, our halfway between answer of 158.5 above is correct.
Halfway Between
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Halfway Between 81 and 237
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