When you ask "What number is halfway between 10 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=10 and Y=490.
To find the number halfway between 10 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 490 into our formula, we get:
(10 + 490)/2 = 250
Thus, the number halfway between 10 and 490 is 250.
To check that our answer is correct, we subtract 10 from 250 and subtract 250 from 490 and compare the two numbers:
250 - 10 = 240
490 - 250 = 240
As you can see, the halfway number is 240 higher than 10 and 240 lower than 490. Therefore, our halfway between answer of 250 above is correct.
Halfway Between
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Halfway Between 10 and 491
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