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28 Number System

The base-28 number system, also called the octovigesimal system, is a positional numeral system that uses twenty-eight symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, and Q, where A represents ten, B eleven, C twelve, D thirteen, E fourteen, F fifteen, G sixteen, H seventeen, I eighteen, J nineteen, K twenty, L twenty-one, M twenty-two, N twenty-three, O twenty-four, P twenty-five, and Q twenty-six in decimal. Each digit’s position represents a power of 28, starting from $28^0$ at the rightmost digit and increasing to the left. For example, the base-28 number 3Q7 equals $3 \times 28^2 + 26 \times 28^1 + 7 \times 28^0 = 2352 + 728 + 7 = 3087$ in decimal. Base-28 is primarily used in theoretical mathematics, number theory, and educational contexts to explore alternative numeral systems, positional notation, and arithmetic patterns. Understanding base-28 allows learners to perform arithmetic operations, convert numbers between bases, and analyze properties of non-decimal systems. Although rarely used in computing or everyday applications, studying the octovigesimal system enhances logical reasoning, problem-solving skills, and comprehension of abstract number representations. It also provides a foundation for higher-level numeral systems and theoretical mathematics.

Number System

The base-12 number system, also known as the duodecimal system, is a positional numeral system that uses twelve symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, and B, where A represents ten and B represents eleven in decimal. Each digit’s position represents a power of 12, starting from $12^0$ at the rightmost digit and increasing to the left. For example, the base-12 number 3B4 equals $3 \times 12^2 + 11 \times 12^1 + 4 \times 12^0 = 432 + 132 + 4 = 568$ in decimal. Base-12 has historically been used in counting systems, timekeeping, and measurements, such as a dozen or hours on a clock. It is valued for its divisibility, as 12 can be evenly divided by 2, 3, 4, and 6, making fraction representation simpler than in decimal. The duodecimal system is also studied in mathematics for its interesting arithmetic properties, positional notation, and numeral patterns. Understanding base-12 provides insights into alternative counting systems, number theory, and conversions between numeral bases. It enhances problem-solving, logical thinking, and understanding of how different bases represent quantities, making it a useful concept in both historical and theoretical mathematics.