When you ask "What number is halfway between 42 and 557?" 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=557.
To find the number halfway between 42 and 557, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 557 into our formula, we get:
(42 + 557)/2 = 299.5
Thus, the number halfway between 42 and 557 is 299.5.
To check that our answer is correct, we subtract 42 from 299.5 and subtract 299.5 from 557 and compare the two numbers:
299.5 - 42 = 257.5
557 - 299.5 = 257.5
As you can see, the halfway number is 257.5 higher than 42 and 257.5 lower than 557. Therefore, our halfway between answer of 299.5 above is correct.
Halfway Between
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Halfway Between 42 and 558
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