When you ask "What number is halfway between 77 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=77 and Y=490.
To find the number halfway between 77 and 490, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 490 into our formula, we get:
(77 + 490)/2 = 283.5
Thus, the number halfway between 77 and 490 is 283.5.
To check that our answer is correct, we subtract 77 from 283.5 and subtract 283.5 from 490 and compare the two numbers:
283.5 - 77 = 206.5
490 - 283.5 = 206.5
As you can see, the halfway number is 206.5 higher than 77 and 206.5 lower than 490. Therefore, our halfway between answer of 283.5 above is correct.
Halfway Between
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Halfway Between 77 and 491
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