When you ask "What number is halfway between 67 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=67 and Y=138.
To find the number halfway between 67 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 67 and 138 into our formula, we get:
(67 + 138)/2 = 102.5
Thus, the number halfway between 67 and 138 is 102.5.
To check that our answer is correct, we subtract 67 from 102.5 and subtract 102.5 from 138 and compare the two numbers:
102.5 - 67 = 35.5
138 - 102.5 = 35.5
As you can see, the halfway number is 35.5 higher than 67 and 35.5 lower than 138. Therefore, our halfway between answer of 102.5 above is correct.
Halfway Between
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Halfway Between 67 and 139
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