When you ask "What number is halfway between 42 and 645?" 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=645.
To find the number halfway between 42 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 645 into our formula, we get:
(42 + 645)/2 = 343.5
Thus, the number halfway between 42 and 645 is 343.5.
To check that our answer is correct, we subtract 42 from 343.5 and subtract 343.5 from 645 and compare the two numbers:
343.5 - 42 = 301.5
645 - 343.5 = 301.5
As you can see, the halfway number is 301.5 higher than 42 and 301.5 lower than 645. Therefore, our halfway between answer of 343.5 above is correct.
Halfway Between
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Halfway Between 42 and 646
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