When you ask "What number is halfway between 12 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=12 and Y=869.
To find the number halfway between 12 and 869, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 869 into our formula, we get:
(12 + 869)/2 = 440.5
Thus, the number halfway between 12 and 869 is 440.5.
To check that our answer is correct, we subtract 12 from 440.5 and subtract 440.5 from 869 and compare the two numbers:
440.5 - 12 = 428.5
869 - 440.5 = 428.5
As you can see, the halfway number is 428.5 higher than 12 and 428.5 lower than 869. Therefore, our halfway between answer of 440.5 above is correct.
Halfway Between
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Halfway Between 12 and 870
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