When you ask "What number is halfway between 21 and 847?" 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=847.
To find the number halfway between 21 and 847, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 847 into our formula, we get:
(21 + 847)/2 = 434
Thus, the number halfway between 21 and 847 is 434.
To check that our answer is correct, we subtract 21 from 434 and subtract 434 from 847 and compare the two numbers:
434 - 21 = 413
847 - 434 = 413
As you can see, the halfway number is 413 higher than 21 and 413 lower than 847. Therefore, our halfway between answer of 434 above is correct.
Halfway Between
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Halfway Between 21 and 848
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