When you ask "What number is halfway between 18 and 407?" 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=407.
To find the number halfway between 18 and 407, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 407 into our formula, we get:
(18 + 407)/2 = 212.5
Thus, the number halfway between 18 and 407 is 212.5.
To check that our answer is correct, we subtract 18 from 212.5 and subtract 212.5 from 407 and compare the two numbers:
212.5 - 18 = 194.5
407 - 212.5 = 194.5
As you can see, the halfway number is 194.5 higher than 18 and 194.5 lower than 407. Therefore, our halfway between answer of 212.5 above is correct.
Halfway Between
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Halfway Between 18 and 408
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