When you ask "What number is halfway between 4 and 18?" 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=18.
To find the number halfway between 4 and 18, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 18 into our formula, we get:
(4 + 18)/2 = 11
Thus, the number halfway between 4 and 18 is 11.
To check that our answer is correct, we subtract 4 from 11 and subtract 11 from 18 and compare the two numbers:
11 - 4 = 7
18 - 11 = 7
As you can see, the halfway number is 7 higher than 4 and 7 lower than 18. Therefore, our halfway between answer of 11 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 4 and 19
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