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  2. Sixth grade - Wikipedia

    en.wikipedia.org/wiki/Sixth_grade

    Sixth grade (also 6th grade or grade 6) is the sixth year of formal or compulsory education. Students in sixth grade are usually 12-13 years old. Students in sixth grade are usually 12-13 years old. It is commonly the first or second grade of middle school or the last grade of elementary school, and the sixth school year since kindergarten .

  3. Duolingo - Wikipedia

    en.wikipedia.org/wiki/Duolingo

    Duolingo Math is an app course for learning elementary mathematics. It was announced on YouTube on August 27, 2022, at the Duocon 2022 event. [70] Duolingo Math covers math topics through an interactive and gradual approach. It starts with basic arithmetic—addition, subtraction, multiplication, and division. The app also teaches fractions and ...

  4. Reading - Wikipedia

    en.wikipedia.org/wiki/Reading

    Reading is the process of taking in the sense or meaning of symbols, often specifically those of a written language, by means of sight or touch. [1] [2] [3] [4]For educators and researchers, reading is a multifaceted process involving such areas as word recognition, orthography (spelling), alphabetics, phonics, phonemic awareness, vocabulary, comprehension, fluency, and motivation.

  5. Moiré pattern - Wikipedia

    en.wikipedia.org/wiki/Moiré_pattern

    For purposes of discussion we shall assume the two primary patterns are each printed in greyscale ink on a white sheet, where the opacity (e.g., shade of grey) of the "printed" part is given by a value between 0 (white) and 1 (black) inclusive, with ⁠ 1 / 2 ⁠ representing neutral grey. Any value less than 0 or greater than 1 using this grey ...

  6. Robert H. Goddard - Wikipedia

    en.wikipedia.org/wiki/Robert_H._Goddard

    He and his team launched 34 rockets between 1926 and 1941, achieving altitudes as high as 2.6 km (1.6 mi) and speeds as fast as 885 km/h (550 mph). [3] Goddard's work as both theorist and engineer anticipated many of the developments that would make spaceflight possible. [4] He has been called the man who ushered in the Space Age.

  7. Gateway Arch - Wikipedia

    en.wikipedia.org/wiki/Gateway_Arch

    The Gateway Arch is a 630-foot-tall (192 m) monument in St. Louis, Missouri, United States.Clad in stainless steel and built in the form of a weighted catenary arch, [5] it is the world's tallest arch [4] and Missouri's tallest accessible structure.

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