When you ask "What number is halfway between 4 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=4 and Y=221.
To find the number halfway between 4 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 221 into our formula, we get:
(4 + 221)/2 = 112.5
Thus, the number halfway between 4 and 221 is 112.5.
To check that our answer is correct, we subtract 4 from 112.5 and subtract 112.5 from 221 and compare the two numbers:
112.5 - 4 = 108.5
221 - 112.5 = 108.5
As you can see, the halfway number is 108.5 higher than 4 and 108.5 lower than 221. Therefore, our halfway between answer of 112.5 above is correct.
Halfway Between
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Halfway Between 4 and 222
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