When you ask "What number is halfway between 18 and 634?" 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=634.
To find the number halfway between 18 and 634, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 634 into our formula, we get:
(18 + 634)/2 = 326
Thus, the number halfway between 18 and 634 is 326.
To check that our answer is correct, we subtract 18 from 326 and subtract 326 from 634 and compare the two numbers:
326 - 18 = 308
634 - 326 = 308
As you can see, the halfway number is 308 higher than 18 and 308 lower than 634. Therefore, our halfway between answer of 326 above is correct.
Halfway Between
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Halfway Between 18 and 635
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