When you ask "What number is halfway between 69 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=69 and Y=509.
To find the number halfway between 69 and 509, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 509 into our formula, we get:
(69 + 509)/2 = 289
Thus, the number halfway between 69 and 509 is 289.
To check that our answer is correct, we subtract 69 from 289 and subtract 289 from 509 and compare the two numbers:
289 - 69 = 220
509 - 289 = 220
As you can see, the halfway number is 220 higher than 69 and 220 lower than 509. Therefore, our halfway between answer of 289 above is correct.
Halfway Between
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Halfway Between 69 and 510
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