When you ask "What number is halfway between 17 and 254?" 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=254.
To find the number halfway between 17 and 254, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 254 into our formula, we get:
(17 + 254)/2 = 135.5
Thus, the number halfway between 17 and 254 is 135.5.
To check that our answer is correct, we subtract 17 from 135.5 and subtract 135.5 from 254 and compare the two numbers:
135.5 - 17 = 118.5
254 - 135.5 = 118.5
As you can see, the halfway number is 118.5 higher than 17 and 118.5 lower than 254. Therefore, our halfway between answer of 135.5 above is correct.
Halfway Between
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Halfway Between 17 and 255
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