When you ask "What number is halfway between 48 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=48 and Y=309.
To find the number halfway between 48 and 309, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 48 and 309 into our formula, we get:
(48 + 309)/2 = 178.5
Thus, the number halfway between 48 and 309 is 178.5.
To check that our answer is correct, we subtract 48 from 178.5 and subtract 178.5 from 309 and compare the two numbers:
178.5 - 48 = 130.5
309 - 178.5 = 130.5
As you can see, the halfway number is 130.5 higher than 48 and 130.5 lower than 309. Therefore, our halfway between answer of 178.5 above is correct.
Halfway Between
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Halfway Between 48 and 310
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