When you ask "What number is halfway between 69 and 690?" 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=690.
To find the number halfway between 69 and 690, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 690 into our formula, we get:
(69 + 690)/2 = 379.5
Thus, the number halfway between 69 and 690 is 379.5.
To check that our answer is correct, we subtract 69 from 379.5 and subtract 379.5 from 690 and compare the two numbers:
379.5 - 69 = 310.5
690 - 379.5 = 310.5
As you can see, the halfway number is 310.5 higher than 69 and 310.5 lower than 690. Therefore, our halfway between answer of 379.5 above is correct.
Halfway Between
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Halfway Between 69 and 691
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