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  2. Polyominoes: Puzzles, Patterns, Problems, and Packings

    en.wikipedia.org/wiki/Polyominoes:_Puzzles...

    A second English-language edition of the book was published by the Princeton University Press in 1994. It added to the corrected text of the original addition two more chapters on recent developments, an expanded bibliography, and two appendices, one giving an enumeration of polyominoes and a second reprinting a report by Andy Liu of the ...

  3. Second grade - Wikipedia

    en.wikipedia.org/wiki/Second_grade

    In Ireland, the equivalent to second grade is known as "Second Class" (usually for 7–8 year olds), which is year 4 of primary school.It is traditionally the year that is dedicated to preparing for the child's "First Holy Communion"; however, as Ireland has become increasingly multicultural, more and more schools are opting to prepare for the sacrament outside of school hours.

  4. Mathematical game - Wikipedia

    en.wikipedia.org/wiki/Mathematical_game

    Mathematical games differ sharply from mathematical puzzles in that mathematical puzzles require specific mathematical expertise to complete, whereas mathematical games do not require a deep knowledge of mathematics to play. Often, the arithmetic core of mathematical games is not readily apparent to players untrained to note the statistical or ...

  5. Northern two-lined salamander - Wikipedia

    en.wikipedia.org/wiki/Northern_two-lined_salamander

    The eggs, when freshly laid appear white or pale yellowish, and each egg is 2.5–3 mm in diameter and is surrounded by two distinct membranes. [12] Communal nesting in northern two-lined salamanders has been documented on several occasions and localities; New York, [13] [14] in Ontario, [15] and likely in Ohio. [12]

  6. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    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. Area of a cloth 4.5m × 2.5m = 11.25m 2; 4 ⁠ 1 / 2 ⁠ × 2 ⁠ 1 / 2 ⁠ = 11 ⁠ 1 / 4 ⁠

  7. Key Stage 2 - Wikipedia

    en.wikipedia.org/wiki/Key_Stage_2

    The term is defined in The Education (Northern Ireland) Order 2006 as "the period beginning at the same time as the next school year after the end of key stage 1 and ending at the same time as the school year in which the majority of pupils in his class complete three school years in that key stage". [4]

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