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2. Standard algorithms - Wikipedia

   en.wikipedia.org/wiki/Standard_algorithms

   For example, through the standard addition algorithm, the sum can be obtained by following three rules: a) line up the digits of each addend by place value, longer digit addends should go on top, b) each addend can be decomposed -- ones are added with ones, tens are added with tens, and so on, and c) if the sum of the digits of the current place value is ten or greater, then the number must be ...

3. Carry (arithmetic) - Wikipedia

   en.wikipedia.org/wiki/Carry_(arithmetic)

   Here, 7 − 9 = −2, so try (10 − 9) + 7 = 8, and the 10 is got by taking ("borrowing") 1 from the next digit to the left. There are two ways in which this is commonly taught: The ten is moved from the next digit left, leaving in this example 3 − 1 in the tens column.

4. Digit-reassembly number - Wikipedia

   en.wikipedia.org/wiki/Digit-reassembly_number

   If only numbers with unique non-zero digits are considered, a three-digit number in base ten can have a digit-sum ranging from 6 = 1+2+3 to 24 = 7+8+9. If these potential digit-sums are used in the formula 2 x digit-sum x 11, the digit-sum of the result will determine whether or not the result is an Osiris number. 1. 2 x 6 x 11 = 132. 2.

5. Digit sum - Wikipedia

   en.wikipedia.org/wiki/Digit_sum

   Digit sums and digital roots can be used for quick divisibility tests: a natural number is divisible by 3 or 9 if and only if its digit sum (or digital root) is divisible by 3 or 9, respectively. For divisibility by 9, this test is called the rule of nines and is the basis of the casting out nines technique for checking calculations.

6. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   The sum of two numbers is unique; there is only one correct answer for a sums. [8] When the sum of a pair of digits results in a two-digit number, the "tens" digit is referred to as the "carry digit". [9] In elementary arithmetic, students typically learn to add whole numbers and may also learn about topics such as negative numbers and fractions.

7. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   The units digit of plus the tens digit of plus The units digit of plus the tens digit of plus The units digit of plus the tens digit of . + + + + + + = carried from the third digit. The fourth digit of the answer is and carry to the next digit. Continue with the same method to obtain the remaining digits. 2 Finger method. Trachtenberg called ...