When you ask "What number is halfway between 69 and 390?" 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=390.
To find the number halfway between 69 and 390, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 390 into our formula, we get:
(69 + 390)/2 = 229.5
Thus, the number halfway between 69 and 390 is 229.5.
To check that our answer is correct, we subtract 69 from 229.5 and subtract 229.5 from 390 and compare the two numbers:
229.5 - 69 = 160.5
390 - 229.5 = 160.5
As you can see, the halfway number is 160.5 higher than 69 and 160.5 lower than 390. Therefore, our halfway between answer of 229.5 above is correct.
Halfway Between
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Halfway Between 69 and 391
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