When you ask "What number is halfway between 55 and 511?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=55 and Y=511.
To find the number halfway between 55 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 511 into our formula, we get:
(55 + 511)/2 = 283
Thus, the number halfway between 55 and 511 is 283.
To check that our answer is correct, we subtract 55 from 283 and subtract 283 from 511 and compare the two numbers:
283 - 55 = 228
511 - 283 = 228
As you can see, the halfway number is 228 higher than 55 and 228 lower than 511. Therefore, our halfway between answer of 283 above is correct.
Halfway Between
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Halfway Between 55 and 512
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