When you ask "What number is halfway between 66 and 261?" 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=261.
To find the number halfway between 66 and 261, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 261 into our formula, we get:
(66 + 261)/2 = 163.5
Thus, the number halfway between 66 and 261 is 163.5.
To check that our answer is correct, we subtract 66 from 163.5 and subtract 163.5 from 261 and compare the two numbers:
163.5 - 66 = 97.5
261 - 163.5 = 97.5
As you can see, the halfway number is 97.5 higher than 66 and 97.5 lower than 261. Therefore, our halfway between answer of 163.5 above is correct.
Halfway Between
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Halfway Between 66 and 262
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