When you ask "What number is halfway between 7 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=7 and Y=515.
To find the number halfway between 7 and 515, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 515 into our formula, we get:
(7 + 515)/2 = 261
Thus, the number halfway between 7 and 515 is 261.
To check that our answer is correct, we subtract 7 from 261 and subtract 261 from 515 and compare the two numbers:
261 - 7 = 254
515 - 261 = 254
As you can see, the halfway number is 254 higher than 7 and 254 lower than 515. Therefore, our halfway between answer of 261 above is correct.
Halfway Between
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Halfway Between 7 and 516
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