When you ask "What number is halfway between 84 and 851?" 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=851.
To find the number halfway between 84 and 851, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 851 into our formula, we get:
(84 + 851)/2 = 467.5
Thus, the number halfway between 84 and 851 is 467.5.
To check that our answer is correct, we subtract 84 from 467.5 and subtract 467.5 from 851 and compare the two numbers:
467.5 - 84 = 383.5
851 - 467.5 = 383.5
As you can see, the halfway number is 383.5 higher than 84 and 383.5 lower than 851. Therefore, our halfway between answer of 467.5 above is correct.
Halfway Between
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Halfway Between 84 and 852
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