When you ask "What number is halfway between 84 and 425?" 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=425.
To find the number halfway between 84 and 425, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 425 into our formula, we get:
(84 + 425)/2 = 254.5
Thus, the number halfway between 84 and 425 is 254.5.
To check that our answer is correct, we subtract 84 from 254.5 and subtract 254.5 from 425 and compare the two numbers:
254.5 - 84 = 170.5
425 - 254.5 = 170.5
As you can see, the halfway number is 170.5 higher than 84 and 170.5 lower than 425. Therefore, our halfway between answer of 254.5 above is correct.
Halfway Between
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Halfway Between 84 and 426
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