When you ask "What number is halfway between 100 and 249?" 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=249.
To find the number halfway between 100 and 249, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 249 into our formula, we get:
(100 + 249)/2 = 174.5
Thus, the number halfway between 100 and 249 is 174.5.
To check that our answer is correct, we subtract 100 from 174.5 and subtract 174.5 from 249 and compare the two numbers:
174.5 - 100 = 74.5
249 - 174.5 = 74.5
As you can see, the halfway number is 74.5 higher than 100 and 74.5 lower than 249. Therefore, our halfway between answer of 174.5 above is correct.
Halfway Between
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Halfway Between 100 and 250
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