When you ask "What number is halfway between 84 and 869?" 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=869.
To find the number halfway between 84 and 869, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 869 into our formula, we get:
(84 + 869)/2 = 476.5
Thus, the number halfway between 84 and 869 is 476.5.
To check that our answer is correct, we subtract 84 from 476.5 and subtract 476.5 from 869 and compare the two numbers:
476.5 - 84 = 392.5
869 - 476.5 = 392.5
As you can see, the halfway number is 392.5 higher than 84 and 392.5 lower than 869. Therefore, our halfway between answer of 476.5 above is correct.
Halfway Between
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