When you ask "What number is halfway between 35 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=35 and Y=138.
To find the number halfway between 35 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 35 and 138 into our formula, we get:
(35 + 138)/2 = 86.5
Thus, the number halfway between 35 and 138 is 86.5.
To check that our answer is correct, we subtract 35 from 86.5 and subtract 86.5 from 138 and compare the two numbers:
86.5 - 35 = 51.5
138 - 86.5 = 51.5
As you can see, the halfway number is 51.5 higher than 35 and 51.5 lower than 138. Therefore, our halfway between answer of 86.5 above is correct.
Halfway Between
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Halfway Between 35 and 139
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