When you ask "What number is halfway between 28 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=28 and Y=138.
To find the number halfway between 28 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 28 and 138 into our formula, we get:
(28 + 138)/2 = 83
Thus, the number halfway between 28 and 138 is 83.
To check that our answer is correct, we subtract 28 from 83 and subtract 83 from 138 and compare the two numbers:
83 - 28 = 55
138 - 83 = 55
As you can see, the halfway number is 55 higher than 28 and 55 lower than 138. Therefore, our halfway between answer of 83 above is correct.
Halfway Between
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Halfway Between 28 and 139
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