When you ask "What number is halfway between 9 and 424?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=424.
To find the number halfway between 9 and 424, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 424 into our formula, we get:
(9 + 424)/2 = 216.5
Thus, the number halfway between 9 and 424 is 216.5.
To check that our answer is correct, we subtract 9 from 216.5 and subtract 216.5 from 424 and compare the two numbers:
216.5 - 9 = 207.5
424 - 216.5 = 207.5
As you can see, the halfway number is 207.5 higher than 9 and 207.5 lower than 424. Therefore, our halfway between answer of 216.5 above is correct.
Halfway Between
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Halfway Between 9 and 425
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