When you ask "What number is halfway between 17 and 221?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=17 and Y=221.
To find the number halfway between 17 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 221 into our formula, we get:
(17 + 221)/2 = 119
Thus, the number halfway between 17 and 221 is 119.
To check that our answer is correct, we subtract 17 from 119 and subtract 119 from 221 and compare the two numbers:
119 - 17 = 102
221 - 119 = 102
As you can see, the halfway number is 102 higher than 17 and 102 lower than 221. Therefore, our halfway between answer of 119 above is correct.
Halfway Between
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Halfway Between 17 and 222
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