The University of Texas at Dallas. Red and yellow tiles can be used to model multiplication. Remember that multiplication can be described as repeated.

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Presentation transcript:

The University of Texas at Dallas

Red and yellow tiles can be used to model multiplication. Remember that multiplication can be described as repeated addition. So 2 x 3 = ? The University of Texas at Dallas 2 groups of 3 tiles = 6 tiles

2 x - 3 means 2 groups of - 3 The University of Texas at Dallas x x - 3 = - 6

Since 2 x 3 = 6 and 3 x 2 = 6, does it make sense that - 3 x 2 = - 6 ? - 3 x 2 = - 6 is true. + 2 x - 3 = - 6 and - 3 x + 2 = - 6 belong to a fact family: The University of Texas at Dallas + 2 x - 3 = x + 2 = ÷ + 2 = ÷ - 6 ÷ - 3 = + 2

Use your tiles to model each multiplication problem. + 2 x + 4 = ? The University of Texas at Dallas ANSWER 2 groups of x + 4 = + 8

+ 3 x - 3 = ? The University of Texas at Dallas ANSWER 3 groups of x - 3 = - 9

- 2 x + 4 = ? The University of Texas at Dallas ANSWER 4 groups of x + 4 = - 8 Use the fact family for - 2 x + 4 = ?  We can’t show - 2 groups of x - 2 = ?  we can show 4 groups of - 2

+ 1, - 1 are opposites the products are opposite Since + 2 and - 2 are opposites of each other, + 2 x - 3 and - 2 x - 3 have opposite products. The University of Texas at Dallas + 1 x + 3 = x + 3 = - 3

To model - 2 x - 3 use 2 groups of the opposite of - 3 The University of Texas at Dallas - 2 x - 3 = + 6

Use tiles to illustrate - 3 x - 4 =? The University of Texas at Dallas ANSWER 3 groups of + 4 (the opposite of - 4) - 3 x - 4 = + 12