When you ask "What number is halfway between 1 and 405?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=1 and Y=405.
To find the number halfway between 1 and 405, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 405 into our formula, we get:
(1 + 405)/2 = 203
Thus, the number halfway between 1 and 405 is 203.
To check that our answer is correct, we subtract 1 from 203 and subtract 203 from 405 and compare the two numbers:
203 - 1 = 202
405 - 203 = 202
As you can see, the halfway number is 202 higher than 1 and 202 lower than 405. Therefore, our halfway between answer of 203 above is correct.
Halfway Between
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Halfway Between 1 and 406
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