When you ask "What number is halfway between 100 and 399?" 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=399.
To find the number halfway between 100 and 399, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 399 into our formula, we get:
(100 + 399)/2 = 249.5
Thus, the number halfway between 100 and 399 is 249.5.
To check that our answer is correct, we subtract 100 from 249.5 and subtract 249.5 from 399 and compare the two numbers:
249.5 - 100 = 149.5
399 - 249.5 = 149.5
As you can see, the halfway number is 149.5 higher than 100 and 149.5 lower than 399. Therefore, our halfway between answer of 249.5 above is correct.
Halfway Between
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Halfway Between 100 and 400
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