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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 sentence - Wikipedia

   en.wikipedia.org/wiki/Number_sentence

   A valid number sentence using a 'less than' symbol: 3 + 6 < 10. A valid number sentence using a 'more than' symbol: 3 + 9 > 11. An example from a lesson plan: [6] Some students will use a direct computational approach. They will carry out the addition 26 + 39 = 65, put 65 = 26 + , and then find that = 39.

4. 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.

5. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   Example of addition with carry. The black numbers are the addends, the green number is the carry, and the blue number is the sum. In the rightmost digit, the addition of 9 and 7 is 16, carrying 1 into the next pair of the digit to the left, making its addition 1 + 5 + 2 = 8. Therefore, 59 + 27 = 86.

6. Lesson Planet - Wikipedia

   en.wikipedia.org/wiki/Lesson_Planet

   Lesson Planet provides teacher-reviewed resources for use by teachers and parents. Its products are designed to supplement traditional and non-traditional education from kindergarten through the 12th grade. The firm was founded in 1999 by James Hurley, and is based in Santa Barbara, California.

7. Trump, asked about chances of war with Iran, says 'anything ...

   www.aol.com/news/trump-asked-chances-war-iran...

   U.S. President-elect Donald Trump said "anything can happen" when asked about the chances of going to war with Iran during his next term in an interview with Time, coinciding with his being named ...