
When you ask "What number is halfway between 99 and 425?" 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=425.

To find the number halfway between 99 and 425, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 425 into our formula, we get:
(99 + 425)/2 = 262
Thus, the number halfway between 99 and 425 is 262.
To check that our answer is correct, we subtract 99 from 262 and subtract 262 from 425 and compare the two numbers:
262 - 99 = 163
425 - 262 = 163
As you can see, the halfway number is 163 higher than 99 and 163 lower than 425. Therefore, our halfway between answer of 262 above is correct.
Halfway Between
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Halfway Between 99 and 426
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