When you ask "What number is halfway between 21 and 259?" 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=259.
To find the number halfway between 21 and 259, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 259 into our formula, we get:
(21 + 259)/2 = 140
Thus, the number halfway between 21 and 259 is 140.
To check that our answer is correct, we subtract 21 from 140 and subtract 140 from 259 and compare the two numbers:
140 - 21 = 119
259 - 140 = 119
As you can see, the halfway number is 119 higher than 21 and 119 lower than 259. Therefore, our halfway between answer of 140 above is correct.
Halfway Between
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Halfway Between 21 and 260
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