When you ask "What number is halfway between 21 and 126?" 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=126.
To find the number halfway between 21 and 126, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 126 into our formula, we get:
(21 + 126)/2 = 73.5
Thus, the number halfway between 21 and 126 is 73.5.
To check that our answer is correct, we subtract 21 from 73.5 and subtract 73.5 from 126 and compare the two numbers:
73.5 - 21 = 52.5
126 - 73.5 = 52.5
As you can see, the halfway number is 52.5 higher than 21 and 52.5 lower than 126. Therefore, our halfway between answer of 73.5 above is correct.
Halfway Between
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Halfway Between 21 and 127
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