When you ask "What number is halfway between 69 and 990?" 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=990.
To find the number halfway between 69 and 990, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 990 into our formula, we get:
(69 + 990)/2 = 529.5
Thus, the number halfway between 69 and 990 is 529.5.
To check that our answer is correct, we subtract 69 from 529.5 and subtract 529.5 from 990 and compare the two numbers:
529.5 - 69 = 460.5
990 - 529.5 = 460.5
As you can see, the halfway number is 460.5 higher than 69 and 460.5 lower than 990. Therefore, our halfway between answer of 529.5 above is correct.
Halfway Between
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Halfway Between 69 and 991
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