I am not quite sure what you mean, but numbers that are very large can be written in scientific notation, so that you don't have to write out all the digits. Assuming, of course, that you only need a limited amount of significant digits.
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Simplify them.
They are used to simplify expressions by helping to reduce the numbers that there is
To simplify 8d -5 +7d -9d, combine the numbers with the ds and don't forget the -5. 8d + 7d - 9d = 6d Simplified, it is 6d - 5.
divide both numbers by a common denominator, e.g. 2, such that the ratio becomes 3:5.
12a2b2 (the numbers are multiplied: 3*2*2=12, the a's are multiplied: a*a=a2, and the b's are multiplied: b*b=b2; the prodeuct of the numbers is listed first, and then the variables in alphabetical order)