When you ask "What number is halfway between 100 and 217?" 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=217.
To find the number halfway between 100 and 217, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 217 into our formula, we get:
(100 + 217)/2 = 158.5
Thus, the number halfway between 100 and 217 is 158.5.
To check that our answer is correct, we subtract 100 from 158.5 and subtract 158.5 from 217 and compare the two numbers:
158.5 - 100 = 58.5
217 - 158.5 = 58.5
As you can see, the halfway number is 58.5 higher than 100 and 58.5 lower than 217. Therefore, our halfway between answer of 158.5 above is correct.
Halfway Between
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Halfway Between 100 and 218
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