When you ask "What number is halfway between 9 and 790?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=790.
To find the number halfway between 9 and 790, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 790 into our formula, we get:
(9 + 790)/2 = 399.5
Thus, the number halfway between 9 and 790 is 399.5.
To check that our answer is correct, we subtract 9 from 399.5 and subtract 399.5 from 790 and compare the two numbers:
399.5 - 9 = 390.5
790 - 399.5 = 390.5
As you can see, the halfway number is 390.5 higher than 9 and 390.5 lower than 790. Therefore, our halfway between answer of 399.5 above is correct.
Halfway Between
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Halfway Between 9 and 791
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