When you ask "What number is halfway between 100 and 699?" 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=699.
To find the number halfway between 100 and 699, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 699 into our formula, we get:
(100 + 699)/2 = 399.5
Thus, the number halfway between 100 and 699 is 399.5.
To check that our answer is correct, we subtract 100 from 399.5 and subtract 399.5 from 699 and compare the two numbers:
399.5 - 100 = 299.5
699 - 399.5 = 299.5
As you can see, the halfway number is 299.5 higher than 100 and 299.5 lower than 699. Therefore, our halfway between answer of 399.5 above is correct.
Halfway Between
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