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2. Fraction - Wikipedia

   en.wikipedia.org/wiki/Fraction

   Aside from sequencing the learning of fractions and operations with fractions, the document provides the following definition of a fraction: "A number expressible in the form ⁠ / ⁠ where is a whole number and is a positive whole number. (The word fraction in these standards always refers to a non-negative number.)" [43] The document itself ...

3. Plus and minus signs - Wikipedia

   en.wikipedia.org/wiki/Plus_and_minus_signs

   The plus sign (+) and the minus sign (−) are mathematical symbols used to denote positive and negative functions, respectively. In addition, + represents the operation of addition, which results in a sum, while − represents subtraction, resulting in a difference. [1] Their use has been extended to many other meanings, more or less analogous.

4. Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arithmetic

   Subtraction is often treated as a special case of addition: instead of subtracting a positive number, it is also possible to add a negative number. For instance = + (). This helps to simplify mathematical computations by reducing the number of basic arithmetic operations needed to perform calculations. [48]

5. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   While primarily associated with natural numbers in arithmetic, subtraction can also represent removing or decreasing physical and abstract quantities using different kinds of objects including negative numbers, fractions, irrational numbers, vectors, decimals, functions, and matrices. [2] In a sense, subtraction is the inverse of addition.

6. Lowest common denominator - Wikipedia

   en.wikipedia.org/wiki/Lowest_common_denominator

   In mathematics, the lowest common denominator or least common denominator (abbreviated LCD) is the lowest common multiple of the denominators of a set of fractions. It simplifies adding, subtracting, and comparing fractions.

7. Addition - Wikipedia

   en.wikipedia.org/wiki/Addition

   The simplest conception of an integer is that it consists of an absolute value (which is a natural number) and a sign (generally either positive or negative). The integer zero is a special third case, being neither positive nor negative. The corresponding definition of addition must proceed by cases: For an integer n, let |n| be its absolute value.