When you ask "What number is halfway between 21 and 416?" 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=416.
To find the number halfway between 21 and 416, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 416 into our formula, we get:
(21 + 416)/2 = 218.5
Thus, the number halfway between 21 and 416 is 218.5.
To check that our answer is correct, we subtract 21 from 218.5 and subtract 218.5 from 416 and compare the two numbers:
218.5 - 21 = 197.5
416 - 218.5 = 197.5
As you can see, the halfway number is 197.5 higher than 21 and 197.5 lower than 416. Therefore, our halfway between answer of 218.5 above is correct.
Halfway Between
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Halfway Between 21 and 417
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