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Which operation needs matching orders?

Exercise and reference answers

Items
  1. Item
    A + B
    Category
    Needs identical orders
  2. Item
    A − B
    Category
    Needs identical orders
  3. Item
    Checking A = B
    Category
    Needs identical orders
  4. Item
    AB
    Category
    Needs inner dimensions to agree
  5. Item
    BC
    Category
    Needs inner dimensions to agree
Categories
  1. Item
    Needs identical orders
  2. Item
    Needs inner dimensions to agree

Explanation

Addition demands identical orders multiplication only needs the inner dimensions to agree. Source: syllabus Maths Part I, Ch 3 Matrices.
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