When you ask "What number is halfway between 21 and 269?" 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=269.
To find the number halfway between 21 and 269, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 269 into our formula, we get:
(21 + 269)/2 = 145
Thus, the number halfway between 21 and 269 is 145.
To check that our answer is correct, we subtract 21 from 145 and subtract 145 from 269 and compare the two numbers:
145 - 21 = 124
269 - 145 = 124
As you can see, the halfway number is 124 higher than 21 and 124 lower than 269. Therefore, our halfway between answer of 145 above is correct.
Halfway Between
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Halfway Between 21 and 270
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