When you ask "What number is halfway between 64 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=64 and Y=139.
To find the number halfway between 64 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 64 and 139 into our formula, we get:
(64 + 139)/2 = 101.5
Thus, the number halfway between 64 and 139 is 101.5.
To check that our answer is correct, we subtract 64 from 101.5 and subtract 101.5 from 139 and compare the two numbers:
101.5 - 64 = 37.5
139 - 101.5 = 37.5
As you can see, the halfway number is 37.5 higher than 64 and 37.5 lower than 139. Therefore, our halfway between answer of 101.5 above is correct.
Halfway Between
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Halfway Between 64 and 140
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