"Hi, Amigo!" "Hi, Bilaabo!" "I want to tell you a little about different numbering systems." "You've already heard that people use the decimal system. Here are the main facts of this system: 1) 10 digits are used to write numbers: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. 2) The number 543 means 5 hundreds + 4 tens + 3 ones. "This is equivalent to writing 5*100 + 4*10 + 3*1, which can be written as 5*102 + 4*101 + 3*100 ..."