
When you ask "What number is halfway between 66 and 252?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=66 and Y=252.

To find the number halfway between 66 and 252, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 252 into our formula, we get:
(66 + 252)/2 = 159
Thus, the number halfway between 66 and 252 is 159.
To check that our answer is correct, we subtract 66 from 159 and subtract 159 from 252 and compare the two numbers:
159 - 66 = 93
252 - 159 = 93
As you can see, the halfway number is 93 higher than 66 and 93 lower than 252. Therefore, our halfway between answer of 159 above is correct.
Halfway Between
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Halfway Between 66 and 253
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