When you ask "What number is halfway between 4 and 9?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=9.
To find the number halfway between 4 and 9, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 9 into our formula, we get:
(4 + 9)/2 = 6.5
Thus, the number halfway between 4 and 9 is 6.5.
To check that our answer is correct, we subtract 4 from 6.5 and subtract 6.5 from 9 and compare the two numbers:
6.5 - 4 = 2.5
9 - 6.5 = 2.5
As you can see, the halfway number is 2.5 higher than 4 and 2.5 lower than 9. Therefore, our halfway between answer of 6.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 4 and 10
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