When you ask "What number is halfway between 79 and 86?" 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=86.
To find the number halfway between 79 and 86, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 86 into our formula, we get:
(79 + 86)/2 = 82.5
Thus, the number halfway between 79 and 86 is 82.5.
To check that our answer is correct, we subtract 79 from 82.5 and subtract 82.5 from 86 and compare the two numbers:
82.5 - 79 = 3.5
86 - 82.5 = 3.5
As you can see, the halfway number is 3.5 higher than 79 and 3.5 lower than 86. Therefore, our halfway between answer of 82.5 above is correct.
Halfway Between
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