When you ask "What number is halfway between 6 and 138?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=6 and Y=138.
To find the number halfway between 6 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 6 and 138 into our formula, we get:
(6 + 138)/2 = 72
Thus, the number halfway between 6 and 138 is 72.
To check that our answer is correct, we subtract 6 from 72 and subtract 72 from 138 and compare the two numbers:
72 - 6 = 66
138 - 72 = 66
As you can see, the halfway number is 66 higher than 6 and 66 lower than 138. Therefore, our halfway between answer of 72 above is correct.
Halfway Between
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Halfway Between 6 and 139
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