When you ask "What number is halfway between 25 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=25 and Y=217.
To find the number halfway between 25 and 217, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 217 into our formula, we get:
(25 + 217)/2 = 121
Thus, the number halfway between 25 and 217 is 121.
To check that our answer is correct, we subtract 25 from 121 and subtract 121 from 217 and compare the two numbers:
121 - 25 = 96
217 - 121 = 96
As you can see, the halfway number is 96 higher than 25 and 96 lower than 217. Therefore, our halfway between answer of 121 above is correct.
Halfway Between
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Halfway Between 25 and 218
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