applet-magic.com Thayer Watkins Silicon Valley & Tornado Alley USA

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
• Quotients and Remainders in Digit Sum Arithmetic
• Illustration of the Quotient Theorem of Digital Arithmetic

---

HOME PAGE OF applet-magic HOME PAGE OF Thayer Watkins