When you ask "What number is halfway between 26 and 643?" 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=643.
To find the number halfway between 26 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 26 and 643 into our formula, we get:
(26 + 643)/2 = 334.5
Thus, the number halfway between 26 and 643 is 334.5.
To check that our answer is correct, we subtract 26 from 334.5 and subtract 334.5 from 643 and compare the two numbers:
334.5 - 26 = 308.5
643 - 334.5 = 308.5
As you can see, the halfway number is 308.5 higher than 26 and 308.5 lower than 643. Therefore, our halfway between answer of 334.5 above is correct.
Halfway Between
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Halfway Between 26 and 644
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