When you ask "What number is halfway between 17 and 556?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=17 and Y=556.
To find the number halfway between 17 and 556, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 556 into our formula, we get:
(17 + 556)/2 = 286.5
Thus, the number halfway between 17 and 556 is 286.5.
To check that our answer is correct, we subtract 17 from 286.5 and subtract 286.5 from 556 and compare the two numbers:
286.5 - 17 = 269.5
556 - 286.5 = 269.5
As you can see, the halfway number is 269.5 higher than 17 and 269.5 lower than 556. Therefore, our halfway between answer of 286.5 above is correct.
Halfway Between
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Halfway Between 17 and 557
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