When you ask "What number is halfway between 15 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=15 and Y=231.
To find the number halfway between 15 and 231, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 231 into our formula, we get:
(15 + 231)/2 = 123
Thus, the number halfway between 15 and 231 is 123.
To check that our answer is correct, we subtract 15 from 123 and subtract 123 from 231 and compare the two numbers:
123 - 15 = 108
231 - 123 = 108
As you can see, the halfway number is 108 higher than 15 and 108 lower than 231. Therefore, our halfway between answer of 123 above is correct.
Halfway Between
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Halfway Between 15 and 232
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