When you ask "What number is halfway between 21 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=21 and Y=138.
To find the number halfway between 21 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 138 into our formula, we get:
(21 + 138)/2 = 79.5
Thus, the number halfway between 21 and 138 is 79.5.
To check that our answer is correct, we subtract 21 from 79.5 and subtract 79.5 from 138 and compare the two numbers:
79.5 - 21 = 58.5
138 - 79.5 = 58.5
As you can see, the halfway number is 58.5 higher than 21 and 58.5 lower than 138. Therefore, our halfway between answer of 79.5 above is correct.
Halfway Between
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Halfway Between 21 and 139
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