When you ask "What number is halfway between 69 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=69 and Y=138.
To find the number halfway between 69 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 138 into our formula, we get:
(69 + 138)/2 = 103.5
Thus, the number halfway between 69 and 138 is 103.5.
To check that our answer is correct, we subtract 69 from 103.5 and subtract 103.5 from 138 and compare the two numbers:
103.5 - 69 = 34.5
138 - 103.5 = 34.5
As you can see, the halfway number is 34.5 higher than 69 and 34.5 lower than 138. Therefore, our halfway between answer of 103.5 above is correct.
Halfway Between
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Halfway Between 69 and 139
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