When you ask "What number is halfway between 99 and 397?" 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=397.
To find the number halfway between 99 and 397, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 397 into our formula, we get:
(99 + 397)/2 = 248
Thus, the number halfway between 99 and 397 is 248.
To check that our answer is correct, we subtract 99 from 248 and subtract 248 from 397 and compare the two numbers:
248 - 99 = 149
397 - 248 = 149
As you can see, the halfway number is 149 higher than 99 and 149 lower than 397. Therefore, our halfway between answer of 248 above is correct.
Halfway Between
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Halfway Between 99 and 398
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