When you ask "What number is halfway between 28 and 409?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=28 and Y=409.
To find the number halfway between 28 and 409, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 28 and 409 into our formula, we get:
(28 + 409)/2 = 218.5
Thus, the number halfway between 28 and 409 is 218.5.
To check that our answer is correct, we subtract 28 from 218.5 and subtract 218.5 from 409 and compare the two numbers:
218.5 - 28 = 190.5
409 - 218.5 = 190.5
As you can see, the halfway number is 190.5 higher than 28 and 190.5 lower than 409. Therefore, our halfway between answer of 218.5 above is correct.
Halfway Between
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Halfway Between 28 and 410
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