When you ask "What number is halfway between 18 and 313?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=313.
To find the number halfway between 18 and 313, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 313 into our formula, we get:
(18 + 313)/2 = 165.5
Thus, the number halfway between 18 and 313 is 165.5.
To check that our answer is correct, we subtract 18 from 165.5 and subtract 165.5 from 313 and compare the two numbers:
165.5 - 18 = 147.5
313 - 165.5 = 147.5
As you can see, the halfway number is 147.5 higher than 18 and 147.5 lower than 313. Therefore, our halfway between answer of 165.5 above is correct.
Halfway Between
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