When you ask "What number is halfway between 1 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=1 and Y=139.
To find the number halfway between 1 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 139 into our formula, we get:
(1 + 139)/2 = 70
Thus, the number halfway between 1 and 139 is 70.
To check that our answer is correct, we subtract 1 from 70 and subtract 70 from 139 and compare the two numbers:
70 - 1 = 69
139 - 70 = 69
As you can see, the halfway number is 69 higher than 1 and 69 lower than 139. Therefore, our halfway between answer of 70 above is correct.
Halfway Between
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Halfway Between 1 and 140
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