When you ask "What number is halfway between 42 and 399?" 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=399.
To find the number halfway between 42 and 399, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 399 into our formula, we get:
(42 + 399)/2 = 220.5
Thus, the number halfway between 42 and 399 is 220.5.
To check that our answer is correct, we subtract 42 from 220.5 and subtract 220.5 from 399 and compare the two numbers:
220.5 - 42 = 178.5
399 - 220.5 = 178.5
As you can see, the halfway number is 178.5 higher than 42 and 178.5 lower than 399. Therefore, our halfway between answer of 220.5 above is correct.
Halfway Between
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Halfway Between 42 and 400
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