When you ask "What number is halfway between 15 and 261?" 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=261.
To find the number halfway between 15 and 261, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 261 into our formula, we get:
(15 + 261)/2 = 138
Thus, the number halfway between 15 and 261 is 138.
To check that our answer is correct, we subtract 15 from 138 and subtract 138 from 261 and compare the two numbers:
138 - 15 = 123
261 - 138 = 123
As you can see, the halfway number is 123 higher than 15 and 123 lower than 261. Therefore, our halfway between answer of 138 above is correct.
Halfway Between
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Halfway Between 15 and 262
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