When you ask "What number is halfway between 15 and 212?" 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=212.
To find the number halfway between 15 and 212, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 212 into our formula, we get:
(15 + 212)/2 = 113.5
Thus, the number halfway between 15 and 212 is 113.5.
To check that our answer is correct, we subtract 15 from 113.5 and subtract 113.5 from 212 and compare the two numbers:
113.5 - 15 = 98.5
212 - 113.5 = 98.5
As you can see, the halfway number is 98.5 higher than 15 and 98.5 lower than 212. Therefore, our halfway between answer of 113.5 above is correct.
Halfway Between
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Halfway Between 15 and 213
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