When you ask "What number is halfway between 42 and 663?" 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=663.
To find the number halfway between 42 and 663, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 663 into our formula, we get:
(42 + 663)/2 = 352.5
Thus, the number halfway between 42 and 663 is 352.5.
To check that our answer is correct, we subtract 42 from 352.5 and subtract 352.5 from 663 and compare the two numbers:
352.5 - 42 = 310.5
663 - 352.5 = 310.5
As you can see, the halfway number is 310.5 higher than 42 and 310.5 lower than 663. Therefore, our halfway between answer of 352.5 above is correct.
Halfway Between
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Halfway Between 42 and 664
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