When you ask "What number is halfway between 7 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=7 and Y=129.
To find the number halfway between 7 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 129 into our formula, we get:
(7 + 129)/2 = 68
Thus, the number halfway between 7 and 129 is 68.
To check that our answer is correct, we subtract 7 from 68 and subtract 68 from 129 and compare the two numbers:
68 - 7 = 61
129 - 68 = 61
As you can see, the halfway number is 61 higher than 7 and 61 lower than 129. Therefore, our halfway between answer of 68 above is correct.
Halfway Between
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Halfway Between 7 and 130
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