When you ask "What number is halfway between 100 and 319?" 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=319.
To find the number halfway between 100 and 319, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 319 into our formula, we get:
(100 + 319)/2 = 209.5
Thus, the number halfway between 100 and 319 is 209.5.
To check that our answer is correct, we subtract 100 from 209.5 and subtract 209.5 from 319 and compare the two numbers:
209.5 - 100 = 109.5
319 - 209.5 = 109.5
As you can see, the halfway number is 109.5 higher than 100 and 109.5 lower than 319. Therefore, our halfway between answer of 209.5 above is correct.
Halfway Between
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Halfway Between 100 and 320
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