When you ask "What number is halfway between 21 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=21 and Y=214.
To find the number halfway between 21 and 214, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 214 into our formula, we get:
(21 + 214)/2 = 117.5
Thus, the number halfway between 21 and 214 is 117.5.
To check that our answer is correct, we subtract 21 from 117.5 and subtract 117.5 from 214 and compare the two numbers:
117.5 - 21 = 96.5
214 - 117.5 = 96.5
As you can see, the halfway number is 96.5 higher than 21 and 96.5 lower than 214. Therefore, our halfway between answer of 117.5 above is correct.
Halfway Between
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Halfway Between 21 and 215
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