When you ask "What number is halfway between 81 and 152?" 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=152.
To find the number halfway between 81 and 152, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 152 into our formula, we get:
(81 + 152)/2 = 116.5
Thus, the number halfway between 81 and 152 is 116.5.
To check that our answer is correct, we subtract 81 from 116.5 and subtract 116.5 from 152 and compare the two numbers:
116.5 - 81 = 35.5
152 - 116.5 = 35.5
As you can see, the halfway number is 35.5 higher than 81 and 35.5 lower than 152. Therefore, our halfway between answer of 116.5 above is correct.
Halfway Between
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Halfway Between 81 and 153
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