100
They don't. Five threes add up to 15 and that is it! You can write an expression using 5 threes that makes 100, but that is not the same.
To determine how many 3's go into 28, you would perform division. 28 divided by 3 equals 9 with a remainder of 1. Therefore, there are 9 whole 3's in 28.
ii
15
100 of them
33.33... the threes never will end.
99 / 3 = 33 threes 100/3 = 33.33 threes which rounded would be equal to 33 threes
210
35
22
They don't. Five threes add up to 15 and that is it! You can write an expression using 5 threes that makes 100, but that is not the same.
103
27 threes are in 81
43 ÷ 3 = 14 with remainder 1
There are: 91/3 = 30 with a remainder of 1
As a decimal, 0.33... where the threes go on and on forever. As a percentage, 33.33.. where, again, the threes go on.