When you ask "What number is halfway between 39 and 217?" 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=217.
To find the number halfway between 39 and 217, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 39 and 217 into our formula, we get:
(39 + 217)/2 = 128
Thus, the number halfway between 39 and 217 is 128.
To check that our answer is correct, we subtract 39 from 128 and subtract 128 from 217 and compare the two numbers:
128 - 39 = 89
217 - 128 = 89
As you can see, the halfway number is 89 higher than 39 and 89 lower than 217. Therefore, our halfway between answer of 128 above is correct.
Halfway Between
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Halfway Between 39 and 218
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