When you ask "What number is halfway between 15 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=15 and Y=628.
To find the number halfway between 15 and 628, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 628 into our formula, we get:
(15 + 628)/2 = 321.5
Thus, the number halfway between 15 and 628 is 321.5.
To check that our answer is correct, we subtract 15 from 321.5 and subtract 321.5 from 628 and compare the two numbers:
321.5 - 15 = 306.5
628 - 321.5 = 306.5
As you can see, the halfway number is 306.5 higher than 15 and 306.5 lower than 628. Therefore, our halfway between answer of 321.5 above is correct.
Halfway Between
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Halfway Between 15 and 629
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