When you ask "What number is halfway between 100 and 203?" 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=203.
To find the number halfway between 100 and 203, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 203 into our formula, we get:
(100 + 203)/2 = 151.5
Thus, the number halfway between 100 and 203 is 151.5.
To check that our answer is correct, we subtract 100 from 151.5 and subtract 151.5 from 203 and compare the two numbers:
151.5 - 100 = 51.5
203 - 151.5 = 51.5
As you can see, the halfway number is 51.5 higher than 100 and 51.5 lower than 203. Therefore, our halfway between answer of 151.5 above is correct.
Halfway Between
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Halfway Between 100 and 204
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