When you ask "What number is halfway between 18 and 231?" 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=231.
To find the number halfway between 18 and 231, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 231 into our formula, we get:
(18 + 231)/2 = 124.5
Thus, the number halfway between 18 and 231 is 124.5.
To check that our answer is correct, we subtract 18 from 124.5 and subtract 124.5 from 231 and compare the two numbers:
124.5 - 18 = 106.5
231 - 124.5 = 106.5
As you can see, the halfway number is 106.5 higher than 18 and 106.5 lower than 231. Therefore, our halfway between answer of 124.5 above is correct.
Halfway Between
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Halfway Between 18 and 232
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