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2. Symbols of grouping - Wikipedia

   en.wikipedia.org/wiki/Symbols_of_grouping

   For example, in the expression 3(x+y) the parentheses are symbols of grouping, but in the expression (3, 5) the parentheses may indicate an open interval. The most common symbols of grouping are the parentheses and the square brackets, and the latter are usually used to avoid too many repeated parentheses.

3. Grid method multiplication - Wikipedia

   en.wikipedia.org/wiki/Grid_method_multiplication

   This is the "grid" or "boxes" structure which gives the multiplication method its name. Faced with a slightly larger multiplication, such as 34 × 13, pupils may initially be encouraged to also break this into tens. So, expanding 34 as 10 + 10 + 10 + 4 and 13 as 10 + 3, the product 34 × 13 might be represented:

4. Fraction - Wikipedia

   en.wikipedia.org/wiki/Fraction

   Since ⁠ 3 / 3 ⁠ equals 1, multiplication by ⁠ 3 / 3 ⁠ does not change the value of the fraction. Second, convert ⁠ 2 / 3 ⁠ into fifteenths by multiplying both the numerator and denominator by five: ⁠ = ⁠. Now it can be seen that

5. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   For example, multiplication is granted a higher precedence than addition, and it has been this way since the introduction of modern algebraic notation. [2] [3] Thus, in the expression 1 + 2 × 3, the multiplication is performed before addition, and the expression has the value 1 + (2 × 3) = 7, and not (1 + 2) × 3 = 9.

6. Bracket (mathematics) - Wikipedia

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

   In elementary algebra, parentheses ( ) are used to specify the order of operations. [1] Terms inside the bracket are evaluated first; hence 2×(3 + 4) is 14, 20 ÷ (5(1 + 1)) is 2 and (2×3) + 4 is 10. This notation is extended to cover more general algebra involving variables: for example (x + y) × (x − y). Square brackets are also often ...

7. Multiplication - Wikipedia

   en.wikipedia.org/wiki/Multiplication

   Four bags with three marbles per bag gives twelve marbles (4 × 3 = 12). Multiplication can also be thought of as scaling. Here, 2 is being multiplied by 3 using scaling, giving 6 as a result. Animation for the multiplication 2 × 3 = 6 4 × 5 = 20. The large rectangle is made up of 20 squares, each 1 unit by 1 unit.