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Digit Sum Arithmetic
Introduction to Digit Sum Arithmetic
The Sum of Digits and Digit Sum for Multiples of Numbers
The Equivalence of Digit Sum Arithmetic and Modular 9 Arithmetic
The Arithmetic of Digit Sums for Addition, Subtraction and Multiplication of Numbers
The Extension of Digit Sum Arithmetic to Division of Numbers
The Digit Sum Arithmetic Does Not Apply for Division by Numbers Whose DigitSum is a Multiple of 3
The Digit Sum for Polynomials
Digit Sum Arithmetic for Repeating Decimals
Digit Sum Arithmetic for Integral Powers of Numbers
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