When you ask "What number is halfway between 10 and 805?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=10 and Y=805.
To find the number halfway between 10 and 805, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 805 into our formula, we get:
(10 + 805)/2 = 407.5
Thus, the number halfway between 10 and 805 is 407.5.
To check that our answer is correct, we subtract 10 from 407.5 and subtract 407.5 from 805 and compare the two numbers:
407.5 - 10 = 397.5
805 - 407.5 = 397.5
As you can see, the halfway number is 397.5 higher than 10 and 397.5 lower than 805. Therefore, our halfway between answer of 407.5 above is correct.
Halfway Between
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