When you ask "What number is halfway between 21 and 130?" 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=130.
To find the number halfway between 21 and 130, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 130 into our formula, we get:
(21 + 130)/2 = 75.5
Thus, the number halfway between 21 and 130 is 75.5.
To check that our answer is correct, we subtract 21 from 75.5 and subtract 75.5 from 130 and compare the two numbers:
75.5 - 21 = 54.5
130 - 75.5 = 54.5
As you can see, the halfway number is 54.5 higher than 21 and 54.5 lower than 130. Therefore, our halfway between answer of 75.5 above is correct.
Halfway Between
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Halfway Between 21 and 131
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