When you ask "What number is halfway between 99 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=99 and Y=639.
To find the number halfway between 99 and 639, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 639 into our formula, we get:
(99 + 639)/2 = 369
Thus, the number halfway between 99 and 639 is 369.
To check that our answer is correct, we subtract 99 from 369 and subtract 369 from 639 and compare the two numbers:
369 - 99 = 270
639 - 369 = 270
As you can see, the halfway number is 270 higher than 99 and 270 lower than 639. Therefore, our halfway between answer of 369 above is correct.
Halfway Between
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Halfway Between 99 and 640
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