When you ask "What number is halfway between 30 and 214?" 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=214.
To find the number halfway between 30 and 214, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 214 into our formula, we get:
(30 + 214)/2 = 122
Thus, the number halfway between 30 and 214 is 122.
To check that our answer is correct, we subtract 30 from 122 and subtract 122 from 214 and compare the two numbers:
122 - 30 = 92
214 - 122 = 92
As you can see, the halfway number is 92 higher than 30 and 92 lower than 214. Therefore, our halfway between answer of 122 above is correct.
Halfway Between
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Halfway Between 30 and 215
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