When you ask "What number is halfway between 9 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=9 and Y=138.
To find the number halfway between 9 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 138 into our formula, we get:
(9 + 138)/2 = 73.5
Thus, the number halfway between 9 and 138 is 73.5.
To check that our answer is correct, we subtract 9 from 73.5 and subtract 73.5 from 138 and compare the two numbers:
73.5 - 9 = 64.5
138 - 73.5 = 64.5
As you can see, the halfway number is 64.5 higher than 9 and 64.5 lower than 138. Therefore, our halfway between answer of 73.5 above is correct.
Halfway Between
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Halfway Between 9 and 139
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