When you ask "What number is halfway between 99 and 409?" 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=409.
To find the number halfway between 99 and 409, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 409 into our formula, we get:
(99 + 409)/2 = 254
Thus, the number halfway between 99 and 409 is 254.
To check that our answer is correct, we subtract 99 from 254 and subtract 254 from 409 and compare the two numbers:
254 - 99 = 155
409 - 254 = 155
As you can see, the halfway number is 155 higher than 99 and 155 lower than 409. Therefore, our halfway between answer of 254 above is correct.
Halfway Between
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Halfway Between 99 and 410
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