When you ask "What number is halfway between 40 and 99?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=40 and Y=99.
To find the number halfway between 40 and 99, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 40 and 99 into our formula, we get:
(40 + 99)/2 = 69.5
Thus, the number halfway between 40 and 99 is 69.5.
To check that our answer is correct, we subtract 40 from 69.5 and subtract 69.5 from 99 and compare the two numbers:
69.5 - 40 = 29.5
99 - 69.5 = 29.5
As you can see, the halfway number is 29.5 higher than 40 and 29.5 lower than 99. Therefore, our halfway between answer of 69.5 above is correct.
Halfway Between
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Halfway Between 40 and 100
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