When you ask "What number is halfway between 100 and 109?" 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=109.
To find the number halfway between 100 and 109, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 109 into our formula, we get:
(100 + 109)/2 = 104.5
Thus, the number halfway between 100 and 109 is 104.5.
To check that our answer is correct, we subtract 100 from 104.5 and subtract 104.5 from 109 and compare the two numbers:
104.5 - 100 = 4.5
109 - 104.5 = 4.5
As you can see, the halfway number is 4.5 higher than 100 and 4.5 lower than 109. Therefore, our halfway between answer of 104.5 above is correct.
Halfway Between
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Halfway Between 100 and 110
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