When you ask "What number is halfway between 17 and 918?" 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=918.
To find the number halfway between 17 and 918, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 918 into our formula, we get:
(17 + 918)/2 = 467.5
Thus, the number halfway between 17 and 918 is 467.5.
To check that our answer is correct, we subtract 17 from 467.5 and subtract 467.5 from 918 and compare the two numbers:
467.5 - 17 = 450.5
918 - 467.5 = 450.5
As you can see, the halfway number is 450.5 higher than 17 and 450.5 lower than 918. Therefore, our halfway between answer of 467.5 above is correct.
Halfway Between
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Halfway Between 17 and 919
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