When you ask "What number is halfway between 100 and 219?" 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=219.
To find the number halfway between 100 and 219, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 219 into our formula, we get:
(100 + 219)/2 = 159.5
Thus, the number halfway between 100 and 219 is 159.5.
To check that our answer is correct, we subtract 100 from 159.5 and subtract 159.5 from 219 and compare the two numbers:
159.5 - 100 = 59.5
219 - 159.5 = 59.5
As you can see, the halfway number is 59.5 higher than 100 and 59.5 lower than 219. Therefore, our halfway between answer of 159.5 above is correct.
Halfway Between
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Halfway Between 100 and 220
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