When you ask "What number is halfway between 91 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=91 and Y=509.
To find the number halfway between 91 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 509 into our formula, we get:
(91 + 509)/2 = 300
Thus, the number halfway between 91 and 509 is 300.
To check that our answer is correct, we subtract 91 from 300 and subtract 300 from 509 and compare the two numbers:
300 - 91 = 209
509 - 300 = 209
As you can see, the halfway number is 209 higher than 91 and 209 lower than 509. Therefore, our halfway between answer of 300 above is correct.
Halfway Between
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Halfway Between 91 and 510
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