When you ask "What number is halfway between 84 and 120?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=84 and Y=120.
To find the number halfway between 84 and 120, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 120 into our formula, we get:
(84 + 120)/2 = 102
Thus, the number halfway between 84 and 120 is 102.
To check that our answer is correct, we subtract 84 from 102 and subtract 102 from 120 and compare the two numbers:
102 - 84 = 18
120 - 102 = 18
As you can see, the halfway number is 18 higher than 84 and 18 lower than 120. Therefore, our halfway between answer of 102 above is correct.
Halfway Between
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Halfway Between 84 and 121
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