When you ask "What number is halfway between 66 and 219?" 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=219.
To find the number halfway between 66 and 219, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 219 into our formula, we get:
(66 + 219)/2 = 142.5
Thus, the number halfway between 66 and 219 is 142.5.
To check that our answer is correct, we subtract 66 from 142.5 and subtract 142.5 from 219 and compare the two numbers:
142.5 - 66 = 76.5
219 - 142.5 = 76.5
As you can see, the halfway number is 76.5 higher than 66 and 76.5 lower than 219. Therefore, our halfway between answer of 142.5 above is correct.
Halfway Between
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Halfway Between 66 and 220
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