When you ask "What number is halfway between 64 and 515?" 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=515.
To find the number halfway between 64 and 515, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 64 and 515 into our formula, we get:
(64 + 515)/2 = 289.5
Thus, the number halfway between 64 and 515 is 289.5.
To check that our answer is correct, we subtract 64 from 289.5 and subtract 289.5 from 515 and compare the two numbers:
289.5 - 64 = 225.5
515 - 289.5 = 225.5
As you can see, the halfway number is 225.5 higher than 64 and 225.5 lower than 515. Therefore, our halfway between answer of 289.5 above is correct.
Halfway Between
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Halfway Between 64 and 516
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