When you ask "What number is halfway between 18 and 897?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=897.
To find the number halfway between 18 and 897, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 897 into our formula, we get:
(18 + 897)/2 = 457.5
Thus, the number halfway between 18 and 897 is 457.5.
To check that our answer is correct, we subtract 18 from 457.5 and subtract 457.5 from 897 and compare the two numbers:
457.5 - 18 = 439.5
897 - 457.5 = 439.5
As you can see, the halfway number is 439.5 higher than 18 and 439.5 lower than 897. Therefore, our halfway between answer of 457.5 above is correct.
Halfway Between
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Halfway Between 18 and 898
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