When you ask "What number is halfway between 84 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=84 and Y=639.
To find the number halfway between 84 and 639, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 639 into our formula, we get:
(84 + 639)/2 = 361.5
Thus, the number halfway between 84 and 639 is 361.5.
To check that our answer is correct, we subtract 84 from 361.5 and subtract 361.5 from 639 and compare the two numbers:
361.5 - 84 = 277.5
639 - 361.5 = 277.5
As you can see, the halfway number is 277.5 higher than 84 and 277.5 lower than 639. Therefore, our halfway between answer of 361.5 above is correct.
Halfway Between
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Halfway Between 84 and 640
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