When you ask "What number is halfway between 51 and 259?" 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=259.
To find the number halfway between 51 and 259, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 259 into our formula, we get:
(51 + 259)/2 = 155
Thus, the number halfway between 51 and 259 is 155.
To check that our answer is correct, we subtract 51 from 155 and subtract 155 from 259 and compare the two numbers:
155 - 51 = 104
259 - 155 = 104
As you can see, the halfway number is 104 higher than 51 and 104 lower than 259. Therefore, our halfway between answer of 155 above is correct.
Halfway Between
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Halfway Between 51 and 260
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