81,000,000,000,000
81,000,000,000,000,000,000
80+1= 81
81 = 8.1 x 101
81
Write the repeating digits over the same number of 9s and simplify: 0.81... has two repeating digits ⇒ the denominator has two 9s, ie 99. ⇒ 0.81... = 81/99 = 9/11
81,000,000,000,000,000,000
81
81+0=81
80+1= 81
81 is a whole number whose simplest form is 81.
81 = 8.1 x 101
81/100
81 = 8.1 × 101
81
81/10
3
81/100