When you ask "What number is halfway between 99 and 440?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=99 and Y=440.
To find the number halfway between 99 and 440, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 440 into our formula, we get:
(99 + 440)/2 = 269.5
Thus, the number halfway between 99 and 440 is 269.5.
To check that our answer is correct, we subtract 99 from 269.5 and subtract 269.5 from 440 and compare the two numbers:
269.5 - 99 = 170.5
440 - 269.5 = 170.5
As you can see, the halfway number is 170.5 higher than 99 and 170.5 lower than 440. Therefore, our halfway between answer of 269.5 above is correct.
Halfway Between
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Halfway Between 99 and 441
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