When you ask "What number is halfway between 21 and 612?" 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=612.
To find the number halfway between 21 and 612, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 612 into our formula, we get:
(21 + 612)/2 = 316.5
Thus, the number halfway between 21 and 612 is 316.5.
To check that our answer is correct, we subtract 21 from 316.5 and subtract 316.5 from 612 and compare the two numbers:
316.5 - 21 = 295.5
612 - 316.5 = 295.5
As you can see, the halfway number is 295.5 higher than 21 and 295.5 lower than 612. Therefore, our halfway between answer of 316.5 above is correct.
Halfway Between
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Halfway Between 21 and 613
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