When you ask "What number is halfway between 84 and 140?" 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=140.
To find the number halfway between 84 and 140, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 140 into our formula, we get:
(84 + 140)/2 = 112
Thus, the number halfway between 84 and 140 is 112.
To check that our answer is correct, we subtract 84 from 112 and subtract 112 from 140 and compare the two numbers:
112 - 84 = 28
140 - 112 = 28
As you can see, the halfway number is 28 higher than 84 and 28 lower than 140. Therefore, our halfway between answer of 112 above is correct.
Halfway Between
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Halfway Between 84 and 141
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