When you ask "What number is halfway between 21 and 267?" 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=267.
To find the number halfway between 21 and 267, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 267 into our formula, we get:
(21 + 267)/2 = 144
Thus, the number halfway between 21 and 267 is 144.
To check that our answer is correct, we subtract 21 from 144 and subtract 144 from 267 and compare the two numbers:
144 - 21 = 123
267 - 144 = 123
As you can see, the halfway number is 123 higher than 21 and 123 lower than 267. Therefore, our halfway between answer of 144 above is correct.
Halfway Between
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Halfway Between 21 and 268
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