When you ask "What number is halfway between 84 and 171?" 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=171.
To find the number halfway between 84 and 171, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 171 into our formula, we get:
(84 + 171)/2 = 127.5
Thus, the number halfway between 84 and 171 is 127.5.
To check that our answer is correct, we subtract 84 from 127.5 and subtract 127.5 from 171 and compare the two numbers:
127.5 - 84 = 43.5
171 - 127.5 = 43.5
As you can see, the halfway number is 43.5 higher than 84 and 43.5 lower than 171. Therefore, our halfway between answer of 127.5 above is correct.
Halfway Between
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Halfway Between 84 and 172
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