When you ask "What number is halfway between 42 and 387?" 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=387.
To find the number halfway between 42 and 387, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 387 into our formula, we get:
(42 + 387)/2 = 214.5
Thus, the number halfway between 42 and 387 is 214.5.
To check that our answer is correct, we subtract 42 from 214.5 and subtract 214.5 from 387 and compare the two numbers:
214.5 - 42 = 172.5
387 - 214.5 = 172.5
As you can see, the halfway number is 172.5 higher than 42 and 172.5 lower than 387. Therefore, our halfway between answer of 214.5 above is correct.
Halfway Between
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Halfway Between 42 and 388
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