When you ask "What number is halfway between 79 and 99?" 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=99.
To find the number halfway between 79 and 99, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 99 into our formula, we get:
(79 + 99)/2 = 89
Thus, the number halfway between 79 and 99 is 89.
To check that our answer is correct, we subtract 79 from 89 and subtract 89 from 99 and compare the two numbers:
89 - 79 = 10
99 - 89 = 10
As you can see, the halfway number is 10 higher than 79 and 10 lower than 99. Therefore, our halfway between answer of 89 above is correct.
Halfway Between
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Halfway Between 79 and 100
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