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2. Dolch word list - Wikipedia

   en.wikipedia.org/wiki/Dolch_word_list

   These lists of words are still assigned for memorization in elementary schools in America and elsewhere. Although most of the 220 Dolch words are phonetic, children are sometimes told that they can't be "sounded out" using common sound-to-letter phonics patterns and have to be learned by sight; hence the alternative term, "sight word".

3. Seventh grade - Wikipedia

   en.wikipedia.org/wiki/Seventh_grade

   Seventh grade (also 7th Grade or Grade 7) is the seventh year of formal or compulsory education. The seventh grade is typically the first or second year of middle school. In the United States, kids in seventh grade are usually around 12–13 years old. Different terms and numbers are used in other parts of the world.

4. List of types of numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_types_of_numbers

   Rational numbers (): Numbers that can be expressed as a ratio of an integer to a non-zero integer. [3] All integers are rational, but there are rational numbers that are not integers, such as −2/9. Real numbers (): Numbers that correspond to points along a line. They can be positive, negative, or zero. All rational numbers are real, but the ...

5. Rational number - Wikipedia

   en.wikipedia.org/wiki/Rational_number

   In mathematics, "rational" is often used as a noun abbreviating "rational number". The adjective rational sometimes means that the coefficients are rational numbers. For example, a rational point is a point with rational coordinates (i.e., a point whose coordinates are rational numbers); a rational matrix is a matrix of rational numbers; a rational polynomial may be a polynomial with rational ...

6. Algebraic number - Wikipedia

   en.wikipedia.org/wiki/Algebraic_number

   An algebraic number is a number that is a root of a non-zero polynomial in one variable with integer (or, equivalently, rational) coefficients. For example, the golden ratio , ( 1 + 5 ) / 2 {\displaystyle (1+{\sqrt {5}})/2} , is an algebraic number, because it is a root of the polynomial x 2 − x − 1 .

7. Category:Rational numbers - Wikipedia

   en.wikipedia.org/wiki/Category:Rational_numbers

   This category represents all rational numbers, that is, those real numbers which can be represented in the form: ...where and are integers and is ...