When you ask "What number is halfway between 15 and 205?" 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=205.
To find the number halfway between 15 and 205, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 205 into our formula, we get:
(15 + 205)/2 = 110
Thus, the number halfway between 15 and 205 is 110.
To check that our answer is correct, we subtract 15 from 110 and subtract 110 from 205 and compare the two numbers:
110 - 15 = 95
205 - 110 = 95
As you can see, the halfway number is 95 higher than 15 and 95 lower than 205. Therefore, our halfway between answer of 110 above is correct.
Halfway Between
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Halfway Between 15 and 206
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