When you ask "What number is halfway between 21 and 846?" 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=846.
To find the number halfway between 21 and 846, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 846 into our formula, we get:
(21 + 846)/2 = 433.5
Thus, the number halfway between 21 and 846 is 433.5.
To check that our answer is correct, we subtract 21 from 433.5 and subtract 433.5 from 846 and compare the two numbers:
433.5 - 21 = 412.5
846 - 433.5 = 412.5
As you can see, the halfway number is 412.5 higher than 21 and 412.5 lower than 846. Therefore, our halfway between answer of 433.5 above is correct.
Halfway Between
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Halfway Between 21 and 847
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