When you ask "What number is halfway between 15 and 266?" 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=266.
To find the number halfway between 15 and 266, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 266 into our formula, we get:
(15 + 266)/2 = 140.5
Thus, the number halfway between 15 and 266 is 140.5.
To check that our answer is correct, we subtract 15 from 140.5 and subtract 140.5 from 266 and compare the two numbers:
140.5 - 15 = 125.5
266 - 140.5 = 125.5
As you can see, the halfway number is 125.5 higher than 15 and 125.5 lower than 266. Therefore, our halfway between answer of 140.5 above is correct.
Halfway Between
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Halfway Between 15 and 267
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