80+1= 81
81 = 8.1 x 101
81,000,000,000,000
81 = 92 or 8.1 × 101
There is no whole number - 81/90 in its simplest form is 9/10 !
81 is a whole number whose simplest form is 81.
81+0=81
Just writing "81" is mathematical enough for my taste. After all, that's a number, and numbers are mathematical.
80+1= 81
Without exponentsWith exponentsIn word form
81 = 8.1 x 101
81/100
No, -81 is not an irrational number because it can be represented in the form x/y = -81
roughly 81 million.
9 to the power of 2 = 81
81,000,000,000,000
81/10