When you ask "What number is halfway between 97 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=97 and Y=990.
To find the number halfway between 97 and 990, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 97 and 990 into our formula, we get:
(97 + 990)/2 = 543.5
Thus, the number halfway between 97 and 990 is 543.5.
To check that our answer is correct, we subtract 97 from 543.5 and subtract 543.5 from 990 and compare the two numbers:
543.5 - 97 = 446.5
990 - 543.5 = 446.5
As you can see, the halfway number is 446.5 higher than 97 and 446.5 lower than 990. Therefore, our halfway between answer of 543.5 above is correct.
Halfway Between
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Halfway Between 97 and 991
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