When you ask "What number is halfway between 18 and 61?" 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=61.
To find the number halfway between 18 and 61, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 61 into our formula, we get:
(18 + 61)/2 = 39.5
Thus, the number halfway between 18 and 61 is 39.5.
To check that our answer is correct, we subtract 18 from 39.5 and subtract 39.5 from 61 and compare the two numbers:
39.5 - 18 = 21.5
61 - 39.5 = 21.5
As you can see, the halfway number is 21.5 higher than 18 and 21.5 lower than 61. Therefore, our halfway between answer of 39.5 above is correct.
Halfway Between
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