240 likes | 572 Views
Early Counting Methods. Early Counting Tokens Tallies. Plain Counting Tokens. Counting Tokens. Ishango Bone. Tally of the Exchequer. Inca Quipu. Base Number Systems. Number Bases Quinary Decimal Duodecimal Vigesimal Sexagesimal. Egyptian Numerals. Egyptian Example.
E N D
Early Counting Methods • Early Counting • Tokens • Tallies
Base Number Systems • Number Bases • Quinary • Decimal • Duodecimal • Vigesimal • Sexagesimal
Roman Numerals • I=1 • V=5 • X=10 • L=50 • C=100 • D=500 • M=1000
Roman Numerals: Subtraction • IV=4 • IX=9 • XL=40 • XC=90 • CD=400 • CM=900 Only symbols that are powers of 10 can be subtracted, and only from the next two largest values.