When you ask "What number is halfway between 79 and 879?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=79 and Y=879.
To find the number halfway between 79 and 879, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 879 into our formula, we get:
(79 + 879)/2 = 479
Thus, the number halfway between 79 and 879 is 479.
To check that our answer is correct, we subtract 79 from 479 and subtract 479 from 879 and compare the two numbers:
479 - 79 = 400
879 - 479 = 400
As you can see, the halfway number is 400 higher than 79 and 400 lower than 879. Therefore, our halfway between answer of 479 above is correct.
Halfway Between
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