When you ask "What number is halfway between 17 and 278?" 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=278.
To find the number halfway between 17 and 278, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 278 into our formula, we get:
(17 + 278)/2 = 147.5
Thus, the number halfway between 17 and 278 is 147.5.
To check that our answer is correct, we subtract 17 from 147.5 and subtract 147.5 from 278 and compare the two numbers:
147.5 - 17 = 130.5
278 - 147.5 = 130.5
As you can see, the halfway number is 130.5 higher than 17 and 130.5 lower than 278. Therefore, our halfway between answer of 147.5 above is correct.
Halfway Between
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Halfway Between 17 and 279
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