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2. Negative number - Wikipedia

   en.wikipedia.org/wiki/Negative_number

   the product of a negative number—al-nāqiṣ (loss)—by a positive number—al-zāʾid (gain)—is negative, and by a negative number is positive. If we subtract a negative number from a higher negative number, the remainder is their negative difference. The difference remains positive if we subtract a negative number from a lower negative ...

3. 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]

4. List of types of numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_types_of_numbers

   Negative numbers: Real numbers that are less than zero. Because zero itself has no sign, neither the positive numbers nor the negative numbers include zero. When zero is a possibility, the following terms are often used: Non-negative numbers: Real numbers that are greater than or equal to zero. Thus a non-negative number is either zero or positive.

5. 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.

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. 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;

8. 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.

9. Plus and minus signs - Wikipedia

   en.wikipedia.org/wiki/Plus_and_minus_signs

   In chemistry, superscripted plus and minus signs are used to indicate an ion with a positive or negative charge of 1 (e.g., NH + 4 ). If the charge is greater than 1, a number indicating the charge is written before the sign (as in SO 2− 4 ).