When you ask "What number is halfway between 100 and 619?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=619.
To find the number halfway between 100 and 619, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 619 into our formula, we get:
(100 + 619)/2 = 359.5
Thus, the number halfway between 100 and 619 is 359.5.
To check that our answer is correct, we subtract 100 from 359.5 and subtract 359.5 from 619 and compare the two numbers:
359.5 - 100 = 259.5
619 - 359.5 = 259.5
As you can see, the halfway number is 259.5 higher than 100 and 259.5 lower than 619. Therefore, our halfway between answer of 359.5 above is correct.
Halfway Between
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