When you ask "What number is halfway between 42 and 664?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=42 and Y=664.
To find the number halfway between 42 and 664, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 664 into our formula, we get:
(42 + 664)/2 = 353
Thus, the number halfway between 42 and 664 is 353.
To check that our answer is correct, we subtract 42 from 353 and subtract 353 from 664 and compare the two numbers:
353 - 42 = 311
664 - 353 = 311
As you can see, the halfway number is 311 higher than 42 and 311 lower than 664. Therefore, our halfway between answer of 353 above is correct.
Halfway Between
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Halfway Between 42 and 665
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