When you ask "What number is halfway between 51 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=51 and Y=515.
To find the number halfway between 51 and 515, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 515 into our formula, we get:
(51 + 515)/2 = 283
Thus, the number halfway between 51 and 515 is 283.
To check that our answer is correct, we subtract 51 from 283 and subtract 283 from 515 and compare the two numbers:
283 - 51 = 232
515 - 283 = 232
As you can see, the halfway number is 232 higher than 51 and 232 lower than 515. Therefore, our halfway between answer of 283 above is correct.
Halfway Between
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Halfway Between 51 and 516
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