When you ask "What number is halfway between 98 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=98 and Y=643.
To find the number halfway between 98 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 98 and 643 into our formula, we get:
(98 + 643)/2 = 370.5
Thus, the number halfway between 98 and 643 is 370.5.
To check that our answer is correct, we subtract 98 from 370.5 and subtract 370.5 from 643 and compare the two numbers:
370.5 - 98 = 272.5
643 - 370.5 = 272.5
As you can see, the halfway number is 272.5 higher than 98 and 272.5 lower than 643. Therefore, our halfway between answer of 370.5 above is correct.
Halfway Between
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Halfway Between 98 and 644
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