When you ask "What number is halfway between 21 and 266?" 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=266.
To find the number halfway between 21 and 266, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 266 into our formula, we get:
(21 + 266)/2 = 143.5
Thus, the number halfway between 21 and 266 is 143.5.
To check that our answer is correct, we subtract 21 from 143.5 and subtract 143.5 from 266 and compare the two numbers:
143.5 - 21 = 122.5
266 - 143.5 = 122.5
As you can see, the halfway number is 122.5 higher than 21 and 122.5 lower than 266. Therefore, our halfway between answer of 143.5 above is correct.
Halfway Between
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Halfway Between 21 and 267
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