When you ask "What number is halfway between 21 and 263?" 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=263.
To find the number halfway between 21 and 263, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 263 into our formula, we get:
(21 + 263)/2 = 142
Thus, the number halfway between 21 and 263 is 142.
To check that our answer is correct, we subtract 21 from 142 and subtract 142 from 263 and compare the two numbers:
142 - 21 = 121
263 - 142 = 121
As you can see, the halfway number is 121 higher than 21 and 121 lower than 263. Therefore, our halfway between answer of 142 above is correct.
Halfway Between
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Halfway Between 21 and 264
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