When you ask "What number is halfway between 18 and 361?" 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=361.
To find the number halfway between 18 and 361, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 361 into our formula, we get:
(18 + 361)/2 = 189.5
Thus, the number halfway between 18 and 361 is 189.5.
To check that our answer is correct, we subtract 18 from 189.5 and subtract 189.5 from 361 and compare the two numbers:
189.5 - 18 = 171.5
361 - 189.5 = 171.5
As you can see, the halfway number is 171.5 higher than 18 and 171.5 lower than 361. Therefore, our halfway between answer of 189.5 above is correct.
Halfway Between
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