When you ask "What number is halfway between 20 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=20 and Y=409.
To find the number halfway between 20 and 409, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 409 into our formula, we get:
(20 + 409)/2 = 214.5
Thus, the number halfway between 20 and 409 is 214.5.
To check that our answer is correct, we subtract 20 from 214.5 and subtract 214.5 from 409 and compare the two numbers:
214.5 - 20 = 194.5
409 - 214.5 = 194.5
As you can see, the halfway number is 194.5 higher than 20 and 194.5 lower than 409. Therefore, our halfway between answer of 214.5 above is correct.
Halfway Between
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Halfway Between 20 and 410
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