When you ask "What number is halfway between 17 and 217?" 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=217.
To find the number halfway between 17 and 217, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 217 into our formula, we get:
(17 + 217)/2 = 117
Thus, the number halfway between 17 and 217 is 117.
To check that our answer is correct, we subtract 17 from 117 and subtract 117 from 217 and compare the two numbers:
117 - 17 = 100
217 - 117 = 100
As you can see, the halfway number is 100 higher than 17 and 100 lower than 217. Therefore, our halfway between answer of 117 above is correct.
Halfway Between
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Halfway Between 17 and 218
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