When you ask "What number is halfway between 4 and 309?" 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=309.
To find the number halfway between 4 and 309, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 309 into our formula, we get:
(4 + 309)/2 = 156.5
Thus, the number halfway between 4 and 309 is 156.5.
To check that our answer is correct, we subtract 4 from 156.5 and subtract 156.5 from 309 and compare the two numbers:
156.5 - 4 = 152.5
309 - 156.5 = 152.5
As you can see, the halfway number is 152.5 higher than 4 and 152.5 lower than 309. Therefore, our halfway between answer of 156.5 above is correct.
Halfway Between
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Halfway Between 4 and 310
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