When you ask "What number is halfway between 84 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=84 and Y=643.
To find the number halfway between 84 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 643 into our formula, we get:
(84 + 643)/2 = 363.5
Thus, the number halfway between 84 and 643 is 363.5.
To check that our answer is correct, we subtract 84 from 363.5 and subtract 363.5 from 643 and compare the two numbers:
363.5 - 84 = 279.5
643 - 363.5 = 279.5
As you can see, the halfway number is 279.5 higher than 84 and 279.5 lower than 643. Therefore, our halfway between answer of 363.5 above is correct.
Halfway Between
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Halfway Between 84 and 644
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