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Multiplication algorithm - wikipedia, The grid method ( box method) introductory method multiple-digit multiplication taught pupils primary school elementary school level.. https://en.wikipedia.org/wiki/Multiplication_algorithm Math 4 - act. 03: multi-digit multiplication, The shows 4 rows 10 3. 4 groups 10 40, 12 altogether; 40 + 12 = 52. activity distributive. http://www.uen.org/Lessonplan/preview?LPid=6095 Multiply conquer - nctm illuminations, 2-digit × 1-digit multiplication arrays 2-digit × 1-digit problems. gauge students' understanding activity determine pacing 2. http://illuminations.nctm.org/Lesson.aspx?id=3210