
When you ask "What number is halfway between 100 and 359?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=359.

To find the number halfway between 100 and 359, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 359 into our formula, we get:
(100 + 359)/2 = 229.5
Thus, the number halfway between 100 and 359 is 229.5.
To check that our answer is correct, we subtract 100 from 229.5 and subtract 229.5 from 359 and compare the two numbers:
229.5 - 100 = 129.5
359 - 229.5 = 129.5
As you can see, the halfway number is 129.5 higher than 100 and 129.5 lower than 359. Therefore, our halfway between answer of 229.5 above is correct.
Halfway Between
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Halfway Between 100 and 360
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