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2. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Multiplication table from 1 to 10 drawn to scale with the upper-right half labeled with prime factorisations 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.

3. 1951 USAF resolution test chart - Wikipedia

   en.wikipedia.org/.../1951_USAF_resolution_test_chart

   A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and ...

4. Educational stage - Wikipedia

   en.wikipedia.org/wiki/Educational_stage

   The first stage of elementary school can last either 3 years (so called 1–3 programme for children starting at the age of 7) or 4 years (so called 1–4 programme for children starting at the age of 6). After of the first stage all pupils enter 5th grade, thus pupils that started at the age of 7 do not attend the 4th grade.

5. Fourth grade - Wikipedia

   en.wikipedia.org/wiki/Fourth_grade

   Fourth grade (also 4th Grade or Grade 4) is the fourth year of formal or compulsory education. It is the fourth year of primary school . Children in fourth grade are usually 9–10 years old.

6. Tales of a Fourth Grade Nothing - Wikipedia

   en.wikipedia.org/wiki/Tales_of_a_Fourth_Grade...

   Tales of a Fourth Grade Nothing. Tales of a Fourth Grade Nothing is a children's novel written by American author Judy Blume and published in 1972. [1] It is the first in the Fudge series and was followed by Otherwise Known as Sheila the Great, Superfudge, Fudge-a-Mania, and Double Fudge (2002). [1][2] Although Otherwise Known as Sheila the ...

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