When you ask "What number is halfway between 51 and 306?" 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=306.
To find the number halfway between 51 and 306, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 306 into our formula, we get:
(51 + 306)/2 = 178.5
Thus, the number halfway between 51 and 306 is 178.5.
To check that our answer is correct, we subtract 51 from 178.5 and subtract 178.5 from 306 and compare the two numbers:
178.5 - 51 = 127.5
306 - 178.5 = 127.5
As you can see, the halfway number is 127.5 higher than 51 and 127.5 lower than 306. Therefore, our halfway between answer of 178.5 above is correct.
Halfway Between
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Halfway Between 51 and 307
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