When you ask "What number is halfway between 98 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=98 and Y=639.
To find the number halfway between 98 and 639, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 98 and 639 into our formula, we get:
(98 + 639)/2 = 368.5
Thus, the number halfway between 98 and 639 is 368.5.
To check that our answer is correct, we subtract 98 from 368.5 and subtract 368.5 from 639 and compare the two numbers:
368.5 - 98 = 270.5
639 - 368.5 = 270.5
As you can see, the halfway number is 270.5 higher than 98 and 270.5 lower than 639. Therefore, our halfway between answer of 368.5 above is correct.
Halfway Between
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Halfway Between 98 and 640
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