When you ask "What number is halfway between 21 and 852?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=852.
To find the number halfway between 21 and 852, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 852 into our formula, we get:
(21 + 852)/2 = 436.5
Thus, the number halfway between 21 and 852 is 436.5.
To check that our answer is correct, we subtract 21 from 436.5 and subtract 436.5 from 852 and compare the two numbers:
436.5 - 21 = 415.5
852 - 436.5 = 415.5
As you can see, the halfway number is 415.5 higher than 21 and 415.5 lower than 852. Therefore, our halfway between answer of 436.5 above is correct.
Halfway Between
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Halfway Between 21 and 853
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