When you ask "What number is halfway between 8 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=8 and Y=138.
To find the number halfway between 8 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 138 into our formula, we get:
(8 + 138)/2 = 73
Thus, the number halfway between 8 and 138 is 73.
To check that our answer is correct, we subtract 8 from 73 and subtract 73 from 138 and compare the two numbers:
73 - 8 = 65
138 - 73 = 65
As you can see, the halfway number is 65 higher than 8 and 65 lower than 138. Therefore, our halfway between answer of 73 above is correct.
Halfway Between
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Halfway Between 8 and 139
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