When you ask "What number is halfway between 5 and 129?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=5 and Y=129.
To find the number halfway between 5 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 129 into our formula, we get:
(5 + 129)/2 = 67
Thus, the number halfway between 5 and 129 is 67.
To check that our answer is correct, we subtract 5 from 67 and subtract 67 from 129 and compare the two numbers:
67 - 5 = 62
129 - 67 = 62
As you can see, the halfway number is 62 higher than 5 and 62 lower than 129. Therefore, our halfway between answer of 67 above is correct.
Halfway Between
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Halfway Between 5 and 130
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