When you ask "What number is halfway between 9 and 438?" 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=438.
To find the number halfway between 9 and 438, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 438 into our formula, we get:
(9 + 438)/2 = 223.5
Thus, the number halfway between 9 and 438 is 223.5.
To check that our answer is correct, we subtract 9 from 223.5 and subtract 223.5 from 438 and compare the two numbers:
223.5 - 9 = 214.5
438 - 223.5 = 214.5
As you can see, the halfway number is 214.5 higher than 9 and 214.5 lower than 438. Therefore, our halfway between answer of 223.5 above is correct.
Halfway Between
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Halfway Between 9 and 439
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