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2. Worksheet - Wikipedia

   en.wikipedia.org/wiki/Worksheet

   In accounting, a worksheet is, or was, a sheet of ruled paper with rows and columns on which an accountant could record information or perform calculations. These are often called columnar pads, and typically green-tinted. In computing, spreadsheet software presents, on a computer monitor, a user interface that resembles one or more paper ...

3. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   Subtraction is an operation that represents removal of objects from a collection. [1] For example, in the adjacent picture, there are 5 − 2 peaches—meaning 5 peaches with 2 taken away, resulting in a total of 3 peaches. Therefore, the difference of 5 and 2 is 3; that is, 5 − 2 = 3.

4. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   Mathematics is a field of study that discovers and organizes methods, theories and theorems that are developed and proved for the needs of empirical sciences and mathematics itself. There are many areas of mathematics, which include number theory (the study of numbers), algebra (the study of formulas and related structures), geometry (the study ...

5. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Multiplication table. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for ...

6. Investigations in Numbers, Data, and Space - Wikipedia

   en.wikipedia.org/wiki/Investigations_in_Numbers...

   Investigations in Numbers, Data, and Space is a K–5 mathematics curriculum, developed at TERC [1] in Cambridge, Massachusetts, United States. The curriculum is often referred to as Investigations or simply TERC. Patterned after the NCTM standards for mathematics, it is among the most widely used of the new reform mathematics curricula.

7. GCFLearnFree.org - Wikipedia

   en.wikipedia.org/wiki/GCFLearnFree.org

   edu.gcfglobal.org. edu.GCFGlobal.org (formerly GCFLearnFree.org) is a free online educational website focusing on technology, job training, reading, and math skills. The site is a program of the Goodwill Community Foundation Inc. (GCF). All content in English is created in Raleigh, North Carolina and all the content in Spanish Bogotá, Colombia ...