When you ask "What number is halfway between 12 and 490?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=12 and Y=490.
To find the number halfway between 12 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 490 into our formula, we get:
(12 + 490)/2 = 251
Thus, the number halfway between 12 and 490 is 251.
To check that our answer is correct, we subtract 12 from 251 and subtract 251 from 490 and compare the two numbers:
251 - 12 = 239
490 - 251 = 239
As you can see, the halfway number is 239 higher than 12 and 239 lower than 490. Therefore, our halfway between answer of 251 above is correct.
Halfway Between
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Halfway Between 12 and 491
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