When you ask "What number is halfway between 18 and 784?" 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=784.
To find the number halfway between 18 and 784, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 784 into our formula, we get:
(18 + 784)/2 = 401
Thus, the number halfway between 18 and 784 is 401.
To check that our answer is correct, we subtract 18 from 401 and subtract 401 from 784 and compare the two numbers:
401 - 18 = 383
784 - 401 = 383
As you can see, the halfway number is 383 higher than 18 and 383 lower than 784. Therefore, our halfway between answer of 401 above is correct.
Halfway Between
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Halfway Between 18 and 785
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