When you ask "What number is halfway between 18 and 628?" 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=628.
To find the number halfway between 18 and 628, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 628 into our formula, we get:
(18 + 628)/2 = 323
Thus, the number halfway between 18 and 628 is 323.
To check that our answer is correct, we subtract 18 from 323 and subtract 323 from 628 and compare the two numbers:
323 - 18 = 305
628 - 323 = 305
As you can see, the halfway number is 305 higher than 18 and 305 lower than 628. Therefore, our halfway between answer of 323 above is correct.
Halfway Between
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Halfway Between 18 and 629
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