When you ask "What number is halfway between 51 and 258?" 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=258.
To find the number halfway between 51 and 258, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 258 into our formula, we get:
(51 + 258)/2 = 154.5
Thus, the number halfway between 51 and 258 is 154.5.
To check that our answer is correct, we subtract 51 from 154.5 and subtract 154.5 from 258 and compare the two numbers:
154.5 - 51 = 103.5
258 - 154.5 = 103.5
As you can see, the halfway number is 103.5 higher than 51 and 103.5 lower than 258. Therefore, our halfway between answer of 154.5 above is correct.
Halfway Between
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Halfway Between 51 and 259
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