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2. File:Multiplication of Positive and Negative Numbers.svg

   en.wikipedia.org/wiki/File:Multiplication_of...

   English: This file is divided into three equal parts. In the left part, the text 2 × 4 is written in black. Below, there is a black number line partially graduated from -8 to 8. The first red arc shaped arrow jumps from 1 to 4. Above it is the text 1 × 4 . An identical arrow jumps from 4 to 8, and the text 2 × 4 is written above.

3. Negative number - Wikipedia

   en.wikipedia.org/wiki/Negative_number

   The laws of arithmetic for negative numbers ensure that the common-sense idea of an opposite is reflected in arithmetic. For example, − ‍ (−3) = 3 because the opposite of an opposite is the original value. Negative numbers are usually written with a minus sign in front. For example, −3 represents a negative quantity with a magnitude of ...

4. Multiplication - Wikipedia

   en.wikipedia.org/wiki/Multiplication

   Multiplication by a positive number preserves the order: For a > 0, if b > c, then ab > ac. Multiplication by a negative number reverses the order: For a < 0, if b > c, then ab < ac. The complex numbers do not have an ordering that is compatible with both addition and multiplication. [30]

5. Plus and minus signs - Wikipedia

   en.wikipedia.org/wiki/Plus_and_minus_signs

   For example, if x = 3, then −x = −3, but if x = −3, then −x = +3. Similarly, −(−x) = x. A prefix of a numeric constant. When it is placed immediately before an unsigned number, the combination names a negative number, the additive inverse of the positive number that the numeral would otherwise name.

6. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   The predecessor of a natural number (excluding zero) is the previous natural number and is the result of subtracting one from that number. For example, the successor of zero is one, and the predecessor of eleven is ten ( 0 + 1 = 1 {\displaystyle 0+1=1} and 11 − 1 = 10 {\displaystyle 11-1=10} ).

7. Talk:Negative number - Wikipedia

   en.wikipedia.org/wiki/Talk:Negative_number

   You are defining that multiplication of negative numbers follows the rules of a ring. If we had that a times b is 0 if either a or b is negative that would also be consistent with the rules for the multiplication for non-negative numbers. It is because we want the rules for negative numbers to be nicer than that that they are defined the way ...