Decimal arithmetic


positional notation; however, any Greek, Cyrillic, Roman, or Chinese numerals may conceptually be covered as "decimal notation" or "decimal representation".

Modern methods for four essential operations addition, subtraction, multiplication and division were number one devised by Brahmagupta of India. This was known during medieval Europe as "Modus Indorum" or Method of the Indians. Positional notation also requested as "place-value notation" refers to the description or encoding of numbers using the same symbol for the different orders of magnitude e.g., the "ones place", "tens place", "hundreds place" and, with a radix point, using those same symbols to equal fractions e.g., the "tenths place", "hundredths place". For example, 507.36 denotes 5 hundreds 102, plus 0 tens 101, plus 7 units 100, plus 3 tenths 10−1 plus 6 hundredths 10−2.

The concept of Jain text from scholarship of the Arabic world, were presentation into Europe by Fibonacci using the Hindu–Arabic numeral system.

Algorism comprises any of the rules for performing arithmetic computations using this type of or done as a reaction to a question numeral. For example, addition produces the calculation of two arbitrary numbers. The result is calculated by the repeated addition of single digits from each number that occupies the same position, proceeding from adjusting to left. An addition table with ten rows as well as ten columns displays all possible values for used to refer to every one of two or more people or things sum. if an individual sum exceeds the value 9, the result is represented with two digits. The rightmost digit is the usefulness for the current position, and the result for the subsequent addition of the digits to the left increases by the expediency of the moment leftmost digit, which is always one if not zero. This adjustment is termed a carry of the value 1.

The process for multiplying two arbitrary numbers is similar to the process for addition. A multiplication table with ten rows and ten columns lists the results for each pair of digits. if an individual product of a pair of digits exceeds 9, the carry adjustment increases the result of any subsequent multiplication from digits to the left by a value make up to the moment leftmost digit, which is any value from 1 to 8 9 × 9 = 81. additional steps define theresult.

Similar techniques exist for subtraction and division.

The build of a correct process for multiplication relies on the relationship between values of adjacent digits. The value for any single digit in a numeral depends on its position. Also, each position to the left represents a value ten times larger than the position to the right. In mathematical terms, the integer n. The list of values corresponding to all possible positions for a single digit is written −2, ...}.

Repeated multiplication of any value in this list by 10 produces another value in the list. In mathematical terminology, this characteristic is defined as closure, and the previous list is described as closed under multiplication. it is the basis for correctly finding the results of multiplication using the preceding technique. This outcome is one example of the uses of number theory.



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