The Distributive Property of Multiplication

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The Distributive Property of Multiplication

• Grade 4 GLE 17

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• Recall the distributive property of
  multiplication over addition . . .
• symbolically
• a (b c) a b a c
• and pictorially (rectangular array area model)

b
c
a b
a c
a
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• An example 6 x 13
• using your mental math skills . . .
• symbolically
• 6 (10 3) 6 10 6 3
• and pictorially (rectangular array area model)

10
3
6 10
6 3
6
4

• What about 12 x 23?
• Mental math skills?
• (102)(203) 1020 103 220 23

20
3
10 20
10
10 3
2 3
2
2 20