When you ask "What number is halfway between 42 and 987?" 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=987.
To find the number halfway between 42 and 987, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 987 into our formula, we get:
(42 + 987)/2 = 514.5
Thus, the number halfway between 42 and 987 is 514.5.
To check that our answer is correct, we subtract 42 from 514.5 and subtract 514.5 from 987 and compare the two numbers:
514.5 - 42 = 472.5
987 - 514.5 = 472.5
As you can see, the halfway number is 472.5 higher than 42 and 472.5 lower than 987. Therefore, our halfway between answer of 514.5 above is correct.
Halfway Between
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Halfway Between 42 and 988
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