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2. Addition - Wikipedia

   en.wikipedia.org/wiki/Addition

   The equivalence class of (a, b) contains either (a – b, 0) if a ≥ b, or (0, b – a) otherwise. If n is a natural number, one can denote +n the equivalence class of (n, 0), and by –n the equivalence class of (0, n). This allows identifying the natural number n with the equivalence class +n. Addition of ordered pairs is done component-wise:

3. Number bond - Wikipedia

   en.wikipedia.org/wiki/Number_bond

   Having acquired some familiar number bonds, children should also soon learn how to use them to develop strategies to complete more complicated sums, for example by navigating from a new sum to an adjacent number bond they know, i.e. 5 + 2 and 4 + 3 are both number bonds that make 7; or by strategies like "making ten", for example recognising ...

4. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   The addition of two numbers is expressed with the plus sign (+). [6] It is performed according to these rules: The order in which the addends are added does not affect the sum. This is known as the commutative property of addition. (a + b) and (b + a) produce the same output. [7] [8]

5. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   [6] [7] [a] The parentheses can be omitted if the input is a single numerical variable or constant, [2] as in the case of sin x = sin(x) and sin π = sin(π). [ a ] Traditionally this convention extends to monomials ; thus, sin 3 x = sin(3 x ) and even sin ⁠ 1 / 2 ⁠ xy = sin( xy /2) , but sin x + y = sin( x ) + y , because x + y is not a ...

6. Worksheet - Wikipedia

   en.wikipedia.org/wiki/Worksheet

   The form comes with two worksheets, one to calculate exemptions, and another to calculate the effects of other income (second job, spouse's job). The bottom number in each worksheet is used to fill out two if the lines in the main W4 form. The main form is filed with the employer, and the worksheets are discarded or held by the employee.

7. My daughter repeated kindergarten because she couldn't read ...

   www.aol.com/daughter-repeated-kindergarten...

   Our daughter finished her second kindergarten year in public school before beginning first grade at a local Catholic school. It cost $10,000 a year, and we were fortunate enough to be able to ...