When you ask "What number is halfway between 98 and 821?" 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=821.
To find the number halfway between 98 and 821, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 98 and 821 into our formula, we get:
(98 + 821)/2 = 459.5
Thus, the number halfway between 98 and 821 is 459.5.
To check that our answer is correct, we subtract 98 from 459.5 and subtract 459.5 from 821 and compare the two numbers:
459.5 - 98 = 361.5
821 - 459.5 = 361.5
As you can see, the halfway number is 361.5 higher than 98 and 361.5 lower than 821. Therefore, our halfway between answer of 459.5 above is correct.
Halfway Between
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Halfway Between 98 and 822
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