When you ask "What number is halfway between 9 and 613?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=613.
To find the number halfway between 9 and 613, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 613 into our formula, we get:
(9 + 613)/2 = 311
Thus, the number halfway between 9 and 613 is 311.
To check that our answer is correct, we subtract 9 from 311 and subtract 311 from 613 and compare the two numbers:
311 - 9 = 302
613 - 311 = 302
As you can see, the halfway number is 302 higher than 9 and 302 lower than 613. Therefore, our halfway between answer of 311 above is correct.
Halfway Between
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