When you ask "What number is halfway between 8 and 423?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=8 and Y=423.
To find the number halfway between 8 and 423, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 423 into our formula, we get:
(8 + 423)/2 = 215.5
Thus, the number halfway between 8 and 423 is 215.5.
To check that our answer is correct, we subtract 8 from 215.5 and subtract 215.5 from 423 and compare the two numbers:
215.5 - 8 = 207.5
423 - 215.5 = 207.5
As you can see, the halfway number is 207.5 higher than 8 and 207.5 lower than 423. Therefore, our halfway between answer of 215.5 above is correct.
Halfway Between
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Halfway Between 8 and 424
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