When you ask "What number is halfway between 42 and 489?" 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=489.
To find the number halfway between 42 and 489, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 489 into our formula, we get:
(42 + 489)/2 = 265.5
Thus, the number halfway between 42 and 489 is 265.5.
To check that our answer is correct, we subtract 42 from 265.5 and subtract 265.5 from 489 and compare the two numbers:
265.5 - 42 = 223.5
489 - 265.5 = 223.5
As you can see, the halfway number is 223.5 higher than 42 and 223.5 lower than 489. Therefore, our halfway between answer of 265.5 above is correct.
Halfway Between
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Halfway Between 42 and 490
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