When you ask "What number is halfway between 66 and 213?" 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=213.
To find the number halfway between 66 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 213 into our formula, we get:
(66 + 213)/2 = 139.5
Thus, the number halfway between 66 and 213 is 139.5.
To check that our answer is correct, we subtract 66 from 139.5 and subtract 139.5 from 213 and compare the two numbers:
139.5 - 66 = 73.5
213 - 139.5 = 73.5
As you can see, the halfway number is 73.5 higher than 66 and 73.5 lower than 213. Therefore, our halfway between answer of 139.5 above is correct.
Halfway Between
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Halfway Between 66 and 214
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