When you ask "What number is halfway between 12 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=12 and Y=987.
To find the number halfway between 12 and 987, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 987 into our formula, we get:
(12 + 987)/2 = 499.5
Thus, the number halfway between 12 and 987 is 499.5.
To check that our answer is correct, we subtract 12 from 499.5 and subtract 499.5 from 987 and compare the two numbers:
499.5 - 12 = 487.5
987 - 499.5 = 487.5
As you can see, the halfway number is 487.5 higher than 12 and 487.5 lower than 987. Therefore, our halfway between answer of 499.5 above is correct.
Halfway Between
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Halfway Between 12 and 988
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