When you ask "What number is halfway between 100 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=100 and Y=397.
To find the number halfway between 100 and 397, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 397 into our formula, we get:
(100 + 397)/2 = 248.5
Thus, the number halfway between 100 and 397 is 248.5.
To check that our answer is correct, we subtract 100 from 248.5 and subtract 248.5 from 397 and compare the two numbers:
248.5 - 100 = 148.5
397 - 248.5 = 148.5
As you can see, the halfway number is 148.5 higher than 100 and 148.5 lower than 397. Therefore, our halfway between answer of 248.5 above is correct.
Halfway Between
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Halfway Between 100 and 398
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