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Order and Entries

Mathematics · Class 10

4 x 3 has 12 entries. First index is the row. A 3 x 3 is square. A 2 x 5 is rectangular (not square).

m x n
rows first
order = rows x columns
keep the ideas separate
Order And Entries: 4 x 3 has 12 entries. First index is the row. A 3 x 3 is square. A 2 x 5 is rectangular (not square)
WHAT — ORDER AND ENTRIES: 4 x 3 has 12 entries. First index is the row. A 3 x 3 is square. A 2 x 5 is rectangular (not square)
HOW — Use the idea: Identify what is given, select this topic's rule or evidence, apply it one step at a time, and check
CORE UNDERSTANDING: 4 x 3 has 12 entries. First index is the row. A 3 x 3 is square. A 2 x 5 is rectangular (not square)

Right triangle — Order and Entries — original sketch for this lesson (not copied from a textbook).