When you ask "What number is halfway between 30 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=30 and Y=221.
To find the number halfway between 30 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 221 into our formula, we get:
(30 + 221)/2 = 125.5
Thus, the number halfway between 30 and 221 is 125.5.
To check that our answer is correct, we subtract 30 from 125.5 and subtract 125.5 from 221 and compare the two numbers:
125.5 - 30 = 95.5
221 - 125.5 = 95.5
As you can see, the halfway number is 95.5 higher than 30 and 95.5 lower than 221. Therefore, our halfway between answer of 125.5 above is correct.
Halfway Between
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Halfway Between 30 and 222
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