there useful because then you will not now were are the thosands
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The associative property in algebra is important for organization of numbers. Rearranging the numbers and parenthesis will not change values but instead make the equation more convenient.
You use scientific notation when it comes to "too large" or "too small" numbers. The reasons why using scientific notation is useful are that it saves time to do the computation and also that it makes people's life easier to compute values instead of writing them out completely!
They are more useful when you are just looking for a range of values or intervals quickly
Individual digits within a number have place values, not whole numbers.
when there are extreme values in the data