When you ask "What number is halfway between 15 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=15 and Y=438.
To find the number halfway between 15 and 438, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 438 into our formula, we get:
(15 + 438)/2 = 226.5
Thus, the number halfway between 15 and 438 is 226.5.
To check that our answer is correct, we subtract 15 from 226.5 and subtract 226.5 from 438 and compare the two numbers:
226.5 - 15 = 211.5
438 - 226.5 = 211.5
As you can see, the halfway number is 211.5 higher than 15 and 211.5 lower than 438. Therefore, our halfway between answer of 226.5 above is correct.
Halfway Between
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Halfway Between 15 and 439
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