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2. 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]

3. Negative number - Wikipedia

   en.wikipedia.org/wiki/Negative_number

   The relationship between negative numbers, positive numbers, and zero is often expressed in the form of a number line: ... When multiplying numbers, the magnitude of ...

4. Positive real numbers - Wikipedia

   en.wikipedia.org/wiki/Positive_real_numbers

   The non-negative real numbers, ... it is an invariant measure with respect to multiplication ... Sign (mathematics) – Number property of being positive or negative;

5. Two's complement - Wikipedia

   en.wikipedia.org/wiki/Two's_complement

   Two's complement is the most common method of representing signed (positive, negative, and zero) integers on computers, [1] and more generally, fixed point binary values. Two's complement uses the binary digit with the greatest value as the sign to indicate whether the binary number is positive or negative; when the most significant bit is 1 the number is signed as negative and when the most ...

6. Sign (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Sign_(mathematics)

   A number is negative if it is less than zero. A number is non-negative if it is greater than or equal to zero. A number is non-positive if it is less than or equal to zero. When 0 is said to be both positive and negative, [citation needed] modified phrases are used to refer to the sign of a number: A number is strictly positive if it is greater ...

7. Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arithmetic

   Common tools in early arithmetic education are number lines, addition and multiplication tables, counting blocks, and abacuses. [186] Later stages focus on a more abstract understanding and introduce the students to different types of numbers, such as negative numbers, fractions, real numbers, and complex numbers.

8. Natural number - Wikipedia

   en.wikipedia.org/wiki/Natural_number

   Sometimes, the whole numbers are the natural numbers plus zero. In other cases, the whole numbers refer to all of the integers, including negative integers. [3] The counting numbers are another term for the natural numbers, particularly in primary school education, and are ambiguous as well although typically start at 1. [4]

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

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

   In the middle part, the text 2 × (-4) is written in black, except for the negative sign, which is blue. Below, there is a black number line partially graduated from -8 to 8. The first blue 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.