When you ask "What number is halfway between 16 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=16 and Y=138.
To find the number halfway between 16 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 16 and 138 into our formula, we get:
(16 + 138)/2 = 77
Thus, the number halfway between 16 and 138 is 77.
To check that our answer is correct, we subtract 16 from 77 and subtract 77 from 138 and compare the two numbers:
77 - 16 = 61
138 - 77 = 61
As you can see, the halfway number is 61 higher than 16 and 61 lower than 138. Therefore, our halfway between answer of 77 above is correct.
Halfway Between
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Halfway Between 16 and 139
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