When you ask "What number is halfway between 68 and 139?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=68 and Y=139.
To find the number halfway between 68 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 68 and 139 into our formula, we get:
(68 + 139)/2 = 103.5
Thus, the number halfway between 68 and 139 is 103.5.
To check that our answer is correct, we subtract 68 from 103.5 and subtract 103.5 from 139 and compare the two numbers:
103.5 - 68 = 35.5
139 - 103.5 = 35.5
As you can see, the halfway number is 35.5 higher than 68 and 35.5 lower than 139. Therefore, our halfway between answer of 103.5 above is correct.
Halfway Between
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Halfway Between 68 and 140
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