When you ask "What number is halfway between 15 and 838?" 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=838.
To find the number halfway between 15 and 838, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 838 into our formula, we get:
(15 + 838)/2 = 426.5
Thus, the number halfway between 15 and 838 is 426.5.
To check that our answer is correct, we subtract 15 from 426.5 and subtract 426.5 from 838 and compare the two numbers:
426.5 - 15 = 411.5
838 - 426.5 = 411.5
As you can see, the halfway number is 411.5 higher than 15 and 411.5 lower than 838. Therefore, our halfway between answer of 426.5 above is correct.
Halfway Between
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Halfway Between 15 and 839
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