Multiplying Fluently by Subtracting from Groups of 10

This lesson teaches how to multiply fluently by subtracting from groups of 10. It begins with a review of 10s quick facts and the commutative property of multiplication. The lesson then demonstrates how to multiply numbers like 4 * 9, 6 * 9, and 9 * 8 using a strategy that involves subtracting from groups of 10. This approach simplifies multiplication by leveraging known facts and reducing the need for direct calculation.

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