When you ask "What number is halfway between 100 and 199?" 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=199.
To find the number halfway between 100 and 199, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 199 into our formula, we get:
(100 + 199)/2 = 149.5
Thus, the number halfway between 100 and 199 is 149.5.
To check that our answer is correct, we subtract 100 from 149.5 and subtract 149.5 from 199 and compare the two numbers:
149.5 - 100 = 49.5
199 - 149.5 = 49.5
As you can see, the halfway number is 49.5 higher than 100 and 49.5 lower than 199. Therefore, our halfway between answer of 149.5 above is correct.
Halfway Between
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Halfway Between 100 and 200
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