When you ask "What number is halfway between 99 and 697?" 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=697.
To find the number halfway between 99 and 697, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 697 into our formula, we get:
(99 + 697)/2 = 398
Thus, the number halfway between 99 and 697 is 398.
To check that our answer is correct, we subtract 99 from 398 and subtract 398 from 697 and compare the two numbers:
398 - 99 = 299
697 - 398 = 299
As you can see, the halfway number is 299 higher than 99 and 299 lower than 697. Therefore, our halfway between answer of 398 above is correct.
Halfway Between
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Halfway Between 99 and 698
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