When you ask "What number is halfway between 15 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=15 and Y=221.
To find the number halfway between 15 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 221 into our formula, we get:
(15 + 221)/2 = 118
Thus, the number halfway between 15 and 221 is 118.
To check that our answer is correct, we subtract 15 from 118 and subtract 118 from 221 and compare the two numbers:
118 - 15 = 103
221 - 118 = 103
As you can see, the halfway number is 103 higher than 15 and 103 lower than 221. Therefore, our halfway between answer of 118 above is correct.
Halfway Between
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Halfway Between 15 and 222
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