When you ask "What number is halfway between 10 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=10 and Y=138.
To find the number halfway between 10 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 138 into our formula, we get:
(10 + 138)/2 = 74
Thus, the number halfway between 10 and 138 is 74.
To check that our answer is correct, we subtract 10 from 74 and subtract 74 from 138 and compare the two numbers:
74 - 10 = 64
138 - 74 = 64
As you can see, the halfway number is 64 higher than 10 and 64 lower than 138. Therefore, our halfway between answer of 74 above is correct.
Halfway Between
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Halfway Between 10 and 139
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