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2. 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.

3. Chisanbop - Wikipedia

   en.wikipedia.org/wiki/Chisanbop

   The Chisanbop system. When a finger is touching the table, it contributes its corresponding number to a total. Chisanbop or chisenbop (from Korean chi (ji) finger + sanpŏp (sanbeop) calculation [1] 지산법/指算法), sometimes called Fingermath, [2] is a finger counting method used to perform basic mathematical operations.

4. File:Multiplication chart.svg - Wikipedia

   en.wikipedia.org/wiki/File:Multiplication_chart.svg

   Download QR code; In other projects ... Multiplication chart.png: ... 1=Multiplication of numbers 0-10. Line labels = first number. X axis = second number.

5. 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]

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. Portal:Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Portal:Arithmetic

   Every positive integer is composite, prime, or the unit 1, so the composite numbers are exactly the numbers that are not prime and not a unit. E.g., the integer 14 is a composite number because it is the product of the two smaller integers 2 × 7 but the integers 2 and 3 are not because each can only be divided by one and itself.