When you ask "What number is halfway between 73 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=73 and Y=990.
To find the number halfway between 73 and 990, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 73 and 990 into our formula, we get:
(73 + 990)/2 = 531.5
Thus, the number halfway between 73 and 990 is 531.5.
To check that our answer is correct, we subtract 73 from 531.5 and subtract 531.5 from 990 and compare the two numbers:
531.5 - 73 = 458.5
990 - 531.5 = 458.5
As you can see, the halfway number is 458.5 higher than 73 and 458.5 lower than 990. Therefore, our halfway between answer of 531.5 above is correct.
Halfway Between
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Halfway Between 73 and 991
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