When you ask "What number is halfway between 66 and 277?" 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=277.
To find the number halfway between 66 and 277, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 277 into our formula, we get:
(66 + 277)/2 = 171.5
Thus, the number halfway between 66 and 277 is 171.5.
To check that our answer is correct, we subtract 66 from 171.5 and subtract 171.5 from 277 and compare the two numbers:
171.5 - 66 = 105.5
277 - 171.5 = 105.5
As you can see, the halfway number is 105.5 higher than 66 and 105.5 lower than 277. Therefore, our halfway between answer of 171.5 above is correct.
Halfway Between
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Halfway Between 66 and 278
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