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2. Lattice multiplication - Wikipedia

   en.wikipedia.org/wiki/Lattice_multiplication

   In this case, the column digit is 5 and the row digit is 2. Write their product, 10, in the cell, with the digit 1 above the diagonal and the digit 0 below the diagonal (see picture for Step 1). If the simple product lacks a digit in the tens place, simply fill in the tens place with a 0. [2] Step 1

3. Digital root - Wikipedia

   en.wikipedia.org/wiki/Digital_root

   Digital root. The digital root (also repeated digital sum) of a natural number in a given radix is the (single digit) value obtained by an iterative process of summing digits, on each iteration using the result from the previous iteration to compute a digit sum. The process continues until a single-digit number is reached.

4. Numeral system - Wikipedia

   en.wikipedia.org/wiki/Numeral_system

   A numeral system is a writing system for expressing numbers; that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. The same sequence of symbols may represent different numbers in different numeral systems. For example, "11" represents the number eleven in the decimal or ...

5. Positional notation - Wikipedia

   en.wikipedia.org/wiki/Positional_notation

   Positional notation (or place-value notation, or positional numeral system) usually denotes the extension to any base of the Hindu–Arabic numeral system (or decimal system ). More generally, a positional system is a numeral system in which the contribution of a digit to the value of a number is the value of the digit multiplied by a factor ...

6. Paper Money Value by Serial Numbers: Determine Your ... - AOL

   www.aol.com/paper-money-value-serial-numbers...

   A good condition, uncirculated $1 radar could sell for about $25 — or even more than $100. If only the end two digits are different (like 27777772), you’ve got a super radar, which is much ...

7. Digit sum - Wikipedia

   en.wikipedia.org/wiki/Digit_sum

   The concept of a decimal digit sum is closely related to, but not the same as, the digital root, which is the result of repeatedly applying the digit sum operation until the remaining value is only a single digit. The decimal digital root of any non-zero integer will be a number in the range 1 to 9, whereas the digit sum can take any value.