When you ask "What number is halfway between 99 and 679?" 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=679.
To find the number halfway between 99 and 679, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 679 into our formula, we get:
(99 + 679)/2 = 389
Thus, the number halfway between 99 and 679 is 389.
To check that our answer is correct, we subtract 99 from 389 and subtract 389 from 679 and compare the two numbers:
389 - 99 = 290
679 - 389 = 290
As you can see, the halfway number is 290 higher than 99 and 290 lower than 679. Therefore, our halfway between answer of 389 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 99 and 680
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