When you ask "What number is halfway between 100 and 299?" 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=299.
To find the number halfway between 100 and 299, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 299 into our formula, we get:
(100 + 299)/2 = 199.5
Thus, the number halfway between 100 and 299 is 199.5.
To check that our answer is correct, we subtract 100 from 199.5 and subtract 199.5 from 299 and compare the two numbers:
199.5 - 100 = 99.5
299 - 199.5 = 99.5
As you can see, the halfway number is 99.5 higher than 100 and 99.5 lower than 299. Therefore, our halfway between answer of 199.5 above is correct.
Halfway Between
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Halfway Between 100 and 300
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