When you ask "What number is halfway between 23 and 840?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=23 and Y=840.
To find the number halfway between 23 and 840, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 23 and 840 into our formula, we get:
(23 + 840)/2 = 431.5
Thus, the number halfway between 23 and 840 is 431.5.
To check that our answer is correct, we subtract 23 from 431.5 and subtract 431.5 from 840 and compare the two numbers:
431.5 - 23 = 408.5
840 - 431.5 = 408.5
As you can see, the halfway number is 408.5 higher than 23 and 408.5 lower than 840. Therefore, our halfway between answer of 431.5 above is correct.
Halfway Between
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Halfway Between 23 and 841
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