When you ask "What number is halfway between 39 and 218?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=39 and Y=218.
To find the number halfway between 39 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 39 and 218 into our formula, we get:
(39 + 218)/2 = 128.5
Thus, the number halfway between 39 and 218 is 128.5.
To check that our answer is correct, we subtract 39 from 128.5 and subtract 128.5 from 218 and compare the two numbers:
128.5 - 39 = 89.5
218 - 128.5 = 89.5
As you can see, the halfway number is 89.5 higher than 39 and 89.5 lower than 218. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 39 and 219
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