When you ask "What number is halfway between 98 and 509?" 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=509.
To find the number halfway between 98 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 98 and 509 into our formula, we get:
(98 + 509)/2 = 303.5
Thus, the number halfway between 98 and 509 is 303.5.
To check that our answer is correct, we subtract 98 from 303.5 and subtract 303.5 from 509 and compare the two numbers:
303.5 - 98 = 205.5
509 - 303.5 = 205.5
As you can see, the halfway number is 205.5 higher than 98 and 205.5 lower than 509. Therefore, our halfway between answer of 303.5 above is correct.
Halfway Between
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Halfway Between 98 and 510
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