When you ask "What number is halfway between 4 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=4 and Y=218.
To find the number halfway between 4 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 218 into our formula, we get:
(4 + 218)/2 = 111
Thus, the number halfway between 4 and 218 is 111.
To check that our answer is correct, we subtract 4 from 111 and subtract 111 from 218 and compare the two numbers:
111 - 4 = 107
218 - 111 = 107
As you can see, the halfway number is 107 higher than 4 and 107 lower than 218. Therefore, our halfway between answer of 111 above is correct.
Halfway Between
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Halfway Between 4 and 219
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