When you ask "What number is halfway between 84 and 403?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=84 and Y=403.
To find the number halfway between 84 and 403, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 403 into our formula, we get:
(84 + 403)/2 = 243.5
Thus, the number halfway between 84 and 403 is 243.5.
To check that our answer is correct, we subtract 84 from 243.5 and subtract 243.5 from 403 and compare the two numbers:
243.5 - 84 = 159.5
403 - 243.5 = 159.5
As you can see, the halfway number is 159.5 higher than 84 and 159.5 lower than 403. Therefore, our halfway between answer of 243.5 above is correct.
Halfway Between
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Halfway Between 84 and 404
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