When you ask "What number is halfway between 51 and 508?" 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=508.
To find the number halfway between 51 and 508, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 508 into our formula, we get:
(51 + 508)/2 = 279.5
Thus, the number halfway between 51 and 508 is 279.5.
To check that our answer is correct, we subtract 51 from 279.5 and subtract 279.5 from 508 and compare the two numbers:
279.5 - 51 = 228.5
508 - 279.5 = 228.5
As you can see, the halfway number is 228.5 higher than 51 and 228.5 lower than 508. Therefore, our halfway between answer of 279.5 above is correct.
Halfway Between
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Halfway Between 51 and 509
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