When you ask "What number is halfway between 100 and 119?" 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=119.
To find the number halfway between 100 and 119, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 119 into our formula, we get:
(100 + 119)/2 = 109.5
Thus, the number halfway between 100 and 119 is 109.5.
To check that our answer is correct, we subtract 100 from 109.5 and subtract 109.5 from 119 and compare the two numbers:
109.5 - 100 = 9.5
119 - 109.5 = 9.5
As you can see, the halfway number is 9.5 higher than 100 and 9.5 lower than 119. Therefore, our halfway between answer of 109.5 above is correct.
Halfway Between
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Halfway Between 100 and 120
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