Quinary

The quinary number system (also known as base-5 or pental) is a number system that use 5 digits (0, 1, 2, 3 and 4). Quinary is related to the decimal system. Examples are 17 in quinary is 32 and 64 in quinary is 224. When you reach 4 it will not be 5 because 5 is not in the quinary system, so it will add a 1 the front and everything else except for the 1 at the front (first digit) to 0, instead of 5 at the back. Quinary is almost half of decimal (1 to 25 only, if they end with 0 or 5 (in decimal)) because 15 in quinary is 30 or 20 in quinary is 40.^[1][2]

Decimal is on the left and Quinary is on the right.

• 0 = 0
• 1 = 1
• 2 = 2
• 3 = 3
• 4 = 4
• 5 = 10
• 6 = 11
• 7 = 12
• 8 = 13
• 9 = 14
• 10 = 20
• 11 = 21
• 12 = 22
• 13 = 23
• 14 = 24
• 15 = 30
• 16 = 31
• 17 = 32
• 18 = 33
• 19 = 34
• 20 = 40

• Binary (Base 2)
• Ternary (Base 3)
• Quaternary (Base 4)
• Senary (Base 6)
• Septenary (Base 7)
• Octal (Base 8)
• Nonary (Base 9)
• Decimal (Base 10)
• Hexadecimal (Base 16)
• Vigesimal (Base 20)