When you ask "What number is halfway between 42 and 449?" 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=449.
To find the number halfway between 42 and 449, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 449 into our formula, we get:
(42 + 449)/2 = 245.5
Thus, the number halfway between 42 and 449 is 245.5.
To check that our answer is correct, we subtract 42 from 245.5 and subtract 245.5 from 449 and compare the two numbers:
245.5 - 42 = 203.5
449 - 245.5 = 203.5
As you can see, the halfway number is 203.5 higher than 42 and 203.5 lower than 449. Therefore, our halfway between answer of 245.5 above is correct.
Halfway Between
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Halfway Between 42 and 450
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