When you ask "What number is halfway between 15 and 394?" 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=394.
To find the number halfway between 15 and 394, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 394 into our formula, we get:
(15 + 394)/2 = 204.5
Thus, the number halfway between 15 and 394 is 204.5.
To check that our answer is correct, we subtract 15 from 204.5 and subtract 204.5 from 394 and compare the two numbers:
204.5 - 15 = 189.5
394 - 204.5 = 189.5
As you can see, the halfway number is 189.5 higher than 15 and 189.5 lower than 394. Therefore, our halfway between answer of 204.5 above is correct.
Halfway Between
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Halfway Between 15 and 395
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