When you ask "What number is halfway between 10 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=10 and Y=221.
To find the number halfway between 10 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 221 into our formula, we get:
(10 + 221)/2 = 115.5
Thus, the number halfway between 10 and 221 is 115.5.
To check that our answer is correct, we subtract 10 from 115.5 and subtract 115.5 from 221 and compare the two numbers:
115.5 - 10 = 105.5
221 - 115.5 = 105.5
As you can see, the halfway number is 105.5 higher than 10 and 105.5 lower than 221. Therefore, our halfway between answer of 115.5 above is correct.
Halfway Between
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Halfway Between 10 and 222
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