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Wiki User
Just writing "81" is mathematical enough for my taste. After all, that's a number, and numbers are mathematical.
81+0=81
3
81/100
|PQ|
16.2 written in fraction form is 81/5
80+1= 81
81 is a whole number whose simplest form is 81.
81 = 8.1 x 101
81,000,000,000,000
81/10
2.5X102
to write in number form