When you ask "What number is halfway between 26 and 639?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=26 and Y=639.
To find the number halfway between 26 and 639, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 26 and 639 into our formula, we get:
(26 + 639)/2 = 332.5
Thus, the number halfway between 26 and 639 is 332.5.
To check that our answer is correct, we subtract 26 from 332.5 and subtract 332.5 from 639 and compare the two numbers:
332.5 - 26 = 306.5
639 - 332.5 = 306.5
As you can see, the halfway number is 306.5 higher than 26 and 306.5 lower than 639. Therefore, our halfway between answer of 332.5 above is correct.
Halfway Between
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Halfway Between 26 and 640
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