When you ask "What number is halfway between 42 and 215?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=42 and Y=215.
To find the number halfway between 42 and 215, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 215 into our formula, we get:
(42 + 215)/2 = 128.5
Thus, the number halfway between 42 and 215 is 128.5.
To check that our answer is correct, we subtract 42 from 128.5 and subtract 128.5 from 215 and compare the two numbers:
128.5 - 42 = 86.5
215 - 128.5 = 86.5
As you can see, the halfway number is 86.5 higher than 42 and 86.5 lower than 215. Therefore, our halfway between answer of 128.5 above is correct.
Halfway Between
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Halfway Between 42 and 216
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