STRATEGIES FOR MULTIPLICATION

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Presentation transcript:

STRATEGIES FOR MULTIPLICATION COMPLETE NUMBER STRATEGIES PARTITIONING STRATEGIES COMPENSATION STRATEGIES USING MULTIPLES OF 10 AND 100 TWO DIGIT MULTIPLIERS (The area model)

COMPLETE NUMBER STRATEGIES Repeated addition: 73 X 4 = 73 + 73 73 146 73 146 219 73 146 292 + 73 292

PARTITIONING STRATEGIES Breaking numbers up in a variety of ways that reflect an understanding of base 10. 27 X 4 268 X 6 20 X 4 = 80 200 X 6 = 1200 7 X 4 = 28 60 X 6 = 360 108 8 X 6 = 48 1608

COMPENSATION STRATEGIES Looking for strategies to manipulate numbers so the calculations are easier (more familiar). Double/Half: 27 X 4 3 X 18 30 X 4 = 120 (3 X 2) X (18 / 2) - 3 X 4 = 12 6 X 9 108

TWO DIGIT MULTIPLIERS (The area model) See Board