When you ask "What number is halfway between 15 and 189?" 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=189.
To find the number halfway between 15 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 189 into our formula, we get:
(15 + 189)/2 = 102
Thus, the number halfway between 15 and 189 is 102.
To check that our answer is correct, we subtract 15 from 102 and subtract 102 from 189 and compare the two numbers:
102 - 15 = 87
189 - 102 = 87
As you can see, the halfway number is 87 higher than 15 and 87 lower than 189. Therefore, our halfway between answer of 102 above is correct.
Halfway Between
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Halfway Between 15 and 190
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