When you ask "What number is halfway between 79 and 84?" 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=84.
To find the number halfway between 79 and 84, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 84 into our formula, we get:
(79 + 84)/2 = 81.5
Thus, the number halfway between 79 and 84 is 81.5.
To check that our answer is correct, we subtract 79 from 81.5 and subtract 81.5 from 84 and compare the two numbers:
81.5 - 79 = 2.5
84 - 81.5 = 2.5
As you can see, the halfway number is 2.5 higher than 79 and 2.5 lower than 84. Therefore, our halfway between answer of 81.5 above is correct.
Halfway Between
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Halfway Between 79 and 85
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