51,000 = 5.1 × 104
4,100 = 4.1 × 103
81 = 8.1 × 101
81
81 = 8.1 × 101
81,000,000,000,000
81
9 x 9 = 81
3 x 3 x 3 x 3 = 81
80+1= 81
81% means, = 81/100 -----------------------the simplest form
81 is a whole number whose simplest form is 81.
81 = 92
81/100
81+0=81