When you ask "What number is halfway between 10 and 491?" 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=491.
To find the number halfway between 10 and 491, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 491 into our formula, we get:
(10 + 491)/2 = 250.5
Thus, the number halfway between 10 and 491 is 250.5.
To check that our answer is correct, we subtract 10 from 250.5 and subtract 250.5 from 491 and compare the two numbers:
250.5 - 10 = 240.5
491 - 250.5 = 240.5
As you can see, the halfway number is 240.5 higher than 10 and 240.5 lower than 491. Therefore, our halfway between answer of 250.5 above is correct.
Halfway Between
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Halfway Between 10 and 492
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