When you ask "What number is halfway between 66 and 571?" 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=571.
To find the number halfway between 66 and 571, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 571 into our formula, we get:
(66 + 571)/2 = 318.5
Thus, the number halfway between 66 and 571 is 318.5.
To check that our answer is correct, we subtract 66 from 318.5 and subtract 318.5 from 571 and compare the two numbers:
318.5 - 66 = 252.5
571 - 318.5 = 252.5
As you can see, the halfway number is 252.5 higher than 66 and 252.5 lower than 571. Therefore, our halfway between answer of 318.5 above is correct.
Halfway Between
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Halfway Between 66 and 572
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