When you ask "What number is halfway between 15 and 190?" 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=190.
To find the number halfway between 15 and 190, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 190 into our formula, we get:
(15 + 190)/2 = 102.5
Thus, the number halfway between 15 and 190 is 102.5.
To check that our answer is correct, we subtract 15 from 102.5 and subtract 102.5 from 190 and compare the two numbers:
102.5 - 15 = 87.5
190 - 102.5 = 87.5
As you can see, the halfway number is 87.5 higher than 15 and 87.5 lower than 190. Therefore, our halfway between answer of 102.5 above is correct.
Halfway Between
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Halfway Between 15 and 191
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