When you ask "What number is halfway between 12 and 423?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=12 and Y=423.
To find the number halfway between 12 and 423, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 423 into our formula, we get:
(12 + 423)/2 = 217.5
Thus, the number halfway between 12 and 423 is 217.5.
To check that our answer is correct, we subtract 12 from 217.5 and subtract 217.5 from 423 and compare the two numbers:
217.5 - 12 = 205.5
423 - 217.5 = 205.5
As you can see, the halfway number is 205.5 higher than 12 and 205.5 lower than 423. Therefore, our halfway between answer of 217.5 above is correct.
Halfway Between
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Halfway Between 12 and 424
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