When you ask "What number is halfway between 64 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=64 and Y=309.
To find the number halfway between 64 and 309, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 64 and 309 into our formula, we get:
(64 + 309)/2 = 186.5
Thus, the number halfway between 64 and 309 is 186.5.
To check that our answer is correct, we subtract 64 from 186.5 and subtract 186.5 from 309 and compare the two numbers:
186.5 - 64 = 122.5
309 - 186.5 = 122.5
As you can see, the halfway number is 122.5 higher than 64 and 122.5 lower than 309. Therefore, our halfway between answer of 186.5 above is correct.
Halfway Between
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Halfway Between 64 and 310
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