When you ask "What number is halfway between 19 and 42?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=19 and Y=42.
To find the number halfway between 19 and 42, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 19 and 42 into our formula, we get:
(19 + 42)/2 = 30.5
Thus, the number halfway between 19 and 42 is 30.5.
To check that our answer is correct, we subtract 19 from 30.5 and subtract 30.5 from 42 and compare the two numbers:
30.5 - 19 = 11.5
42 - 30.5 = 11.5
As you can see, the halfway number is 11.5 higher than 19 and 11.5 lower than 42. Therefore, our halfway between answer of 30.5 above is correct.
Halfway Between
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