51. 51. 51. 51.
There are 9 threes in 28... with a remainder of 1 !
210
35
22
100 of them
33.3333333 3's go into 100
100
27 threes are in 81
43 ÷ 3 = 14 with remainder 1
There are: 91/3 = 30 with a remainder of 1
33.33... the threes never will end.