When you ask "What number is halfway between 49 and 990?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=49 and Y=990.
To find the number halfway between 49 and 990, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 49 and 990 into our formula, we get:
(49 + 990)/2 = 519.5
Thus, the number halfway between 49 and 990 is 519.5.
To check that our answer is correct, we subtract 49 from 519.5 and subtract 519.5 from 990 and compare the two numbers:
519.5 - 49 = 470.5
990 - 519.5 = 470.5
As you can see, the halfway number is 470.5 higher than 49 and 470.5 lower than 990. Therefore, our halfway between answer of 519.5 above is correct.
Halfway Between
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Halfway Between 49 and 991
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