When you ask "What number is halfway between 100 and 449?" 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=449.
To find the number halfway between 100 and 449, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 449 into our formula, we get:
(100 + 449)/2 = 274.5
Thus, the number halfway between 100 and 449 is 274.5.
To check that our answer is correct, we subtract 100 from 274.5 and subtract 274.5 from 449 and compare the two numbers:
274.5 - 100 = 174.5
449 - 274.5 = 174.5
As you can see, the halfway number is 174.5 higher than 100 and 174.5 lower than 449. Therefore, our halfway between answer of 274.5 above is correct.
Halfway Between
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Halfway Between 100 and 450
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