When you ask "What number is halfway between 42 and 991?" 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=991.
To find the number halfway between 42 and 991, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 991 into our formula, we get:
(42 + 991)/2 = 516.5
Thus, the number halfway between 42 and 991 is 516.5.
To check that our answer is correct, we subtract 42 from 516.5 and subtract 516.5 from 991 and compare the two numbers:
516.5 - 42 = 474.5
991 - 516.5 = 474.5
As you can see, the halfway number is 474.5 higher than 42 and 474.5 lower than 991. Therefore, our halfway between answer of 516.5 above is correct.
Halfway Between
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Halfway Between 42 and 992
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