When you ask "What number is halfway between 99 and 438?" 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=438.
To find the number halfway between 99 and 438, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 438 into our formula, we get:
(99 + 438)/2 = 268.5
Thus, the number halfway between 99 and 438 is 268.5.
To check that our answer is correct, we subtract 99 from 268.5 and subtract 268.5 from 438 and compare the two numbers:
268.5 - 99 = 169.5
438 - 268.5 = 169.5
As you can see, the halfway number is 169.5 higher than 99 and 169.5 lower than 438. Therefore, our halfway between answer of 268.5 above is correct.
Halfway Between
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Halfway Between 99 and 439
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