
When you ask "What number is halfway between 4 and 545?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=545.

To find the number halfway between 4 and 545, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 545 into our formula, we get:
(4 + 545)/2 = 274.5
Thus, the number halfway between 4 and 545 is 274.5.
To check that our answer is correct, we subtract 4 from 274.5 and subtract 274.5 from 545 and compare the two numbers:
274.5 - 4 = 270.5
545 - 274.5 = 270.5
As you can see, the halfway number is 270.5 higher than 4 and 270.5 lower than 545. Therefore, our halfway between answer of 274.5 above is correct.
Halfway Between
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Halfway Between 4 and 546
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