When you ask "What number is halfway between 18 and 201?" 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=201.
To find the number halfway between 18 and 201, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 201 into our formula, we get:
(18 + 201)/2 = 109.5
Thus, the number halfway between 18 and 201 is 109.5.
To check that our answer is correct, we subtract 18 from 109.5 and subtract 109.5 from 201 and compare the two numbers:
109.5 - 18 = 91.5
201 - 109.5 = 91.5
As you can see, the halfway number is 91.5 higher than 18 and 91.5 lower than 201. Therefore, our halfway between answer of 109.5 above is correct.
Halfway Between
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Halfway Between 18 and 202
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