When you ask "What number is halfway between 100 and 393?" 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=393.
To find the number halfway between 100 and 393, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 393 into our formula, we get:
(100 + 393)/2 = 246.5
Thus, the number halfway between 100 and 393 is 246.5.
To check that our answer is correct, we subtract 100 from 246.5 and subtract 246.5 from 393 and compare the two numbers:
246.5 - 100 = 146.5
393 - 246.5 = 146.5
As you can see, the halfway number is 146.5 higher than 100 and 146.5 lower than 393. Therefore, our halfway between answer of 246.5 above is correct.
Halfway Between
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Halfway Between 100 and 394
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