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Which operation keeps rationals closed?

Exercise and reference answers

Items
  1. Item
    Addition
    Category
    Closed
  2. Item
    Subtraction
    Category
    Closed
  3. Item
    Multiplication
    Category
    Closed
  4. Item
    Division by zero
    Category
    Not stated as closed
Categories
  1. Item
    Closed
  2. Item
    Not stated as closed

Explanation

Three of the four operations are safe, as the chapter states. Source: syllabus Maths, Ch 1 Rational Numbers.
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