When you ask "What number is halfway between 51 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=51 and Y=139.
To find the number halfway between 51 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 139 into our formula, we get:
(51 + 139)/2 = 95
Thus, the number halfway between 51 and 139 is 95.
To check that our answer is correct, we subtract 51 from 95 and subtract 95 from 139 and compare the two numbers:
95 - 51 = 44
139 - 95 = 44
As you can see, the halfway number is 44 higher than 51 and 44 lower than 139. Therefore, our halfway between answer of 95 above is correct.
Halfway Between
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Halfway Between 51 and 140
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