When you ask "What number is halfway between 15 and 354?" 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=354.
To find the number halfway between 15 and 354, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 354 into our formula, we get:
(15 + 354)/2 = 184.5
Thus, the number halfway between 15 and 354 is 184.5.
To check that our answer is correct, we subtract 15 from 184.5 and subtract 184.5 from 354 and compare the two numbers:
184.5 - 15 = 169.5
354 - 184.5 = 169.5
As you can see, the halfway number is 169.5 higher than 15 and 169.5 lower than 354. Therefore, our halfway between answer of 184.5 above is correct.
Halfway Between
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Halfway Between 15 and 355
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