When you ask "What number is halfway between 17 and 660?" 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=660.
To find the number halfway between 17 and 660, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 660 into our formula, we get:
(17 + 660)/2 = 338.5
Thus, the number halfway between 17 and 660 is 338.5.
To check that our answer is correct, we subtract 17 from 338.5 and subtract 338.5 from 660 and compare the two numbers:
338.5 - 17 = 321.5
660 - 338.5 = 321.5
As you can see, the halfway number is 321.5 higher than 17 and 321.5 lower than 660. Therefore, our halfway between answer of 338.5 above is correct.
Halfway Between
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