When you ask "What number is halfway between 36 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=36 and Y=643.
To find the number halfway between 36 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 36 and 643 into our formula, we get:
(36 + 643)/2 = 339.5
Thus, the number halfway between 36 and 643 is 339.5.
To check that our answer is correct, we subtract 36 from 339.5 and subtract 339.5 from 643 and compare the two numbers:
339.5 - 36 = 303.5
643 - 339.5 = 303.5
As you can see, the halfway number is 303.5 higher than 36 and 303.5 lower than 643. Therefore, our halfway between answer of 339.5 above is correct.
Halfway Between
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Halfway Between 36 and 644
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