When you ask "What number is halfway between 18 and 785?" 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=785.
To find the number halfway between 18 and 785, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 785 into our formula, we get:
(18 + 785)/2 = 401.5
Thus, the number halfway between 18 and 785 is 401.5.
To check that our answer is correct, we subtract 18 from 401.5 and subtract 401.5 from 785 and compare the two numbers:
401.5 - 18 = 383.5
785 - 401.5 = 383.5
As you can see, the halfway number is 383.5 higher than 18 and 383.5 lower than 785. Therefore, our halfway between answer of 401.5 above is correct.
Halfway Between
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Halfway Between 18 and 786
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