When you ask "What number is halfway between 81 and 200?" 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=200.
To find the number halfway between 81 and 200, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 200 into our formula, we get:
(81 + 200)/2 = 140.5
Thus, the number halfway between 81 and 200 is 140.5.
To check that our answer is correct, we subtract 81 from 140.5 and subtract 140.5 from 200 and compare the two numbers:
140.5 - 81 = 59.5
200 - 140.5 = 59.5
As you can see, the halfway number is 59.5 higher than 81 and 59.5 lower than 200. Therefore, our halfway between answer of 140.5 above is correct.
Halfway Between
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Halfway Between 81 and 201
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