When you ask "What number is halfway between 21 and 620?" 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=620.
To find the number halfway between 21 and 620, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 620 into our formula, we get:
(21 + 620)/2 = 320.5
Thus, the number halfway between 21 and 620 is 320.5.
To check that our answer is correct, we subtract 21 from 320.5 and subtract 320.5 from 620 and compare the two numbers:
320.5 - 21 = 299.5
620 - 320.5 = 299.5
As you can see, the halfway number is 299.5 higher than 21 and 299.5 lower than 620. Therefore, our halfway between answer of 320.5 above is correct.
Halfway Between
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