When you ask "What number is halfway between 100 and 845?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=845.
To find the number halfway between 100 and 845, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 845 into our formula, we get:
(100 + 845)/2 = 472.5
Thus, the number halfway between 100 and 845 is 472.5.
To check that our answer is correct, we subtract 100 from 472.5 and subtract 472.5 from 845 and compare the two numbers:
472.5 - 100 = 372.5
845 - 472.5 = 372.5
As you can see, the halfway number is 372.5 higher than 100 and 372.5 lower than 845. Therefore, our halfway between answer of 472.5 above is correct.
Halfway Between
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Halfway Between 100 and 846
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