When you ask "What number is halfway between 18 and 79?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=79.
To find the number halfway between 18 and 79, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 79 into our formula, we get:
(18 + 79)/2 = 48.5
Thus, the number halfway between 18 and 79 is 48.5.
To check that our answer is correct, we subtract 18 from 48.5 and subtract 48.5 from 79 and compare the two numbers:
48.5 - 18 = 30.5
79 - 48.5 = 30.5
As you can see, the halfway number is 30.5 higher than 18 and 30.5 lower than 79. Therefore, our halfway between answer of 48.5 above is correct.
Halfway Between
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