Splash Screen. Lesson Menu Five-Minute Check (over Lesson 3–6) Main Idea Key Concept: Multiplication Properties Example 1:Identify Multiplication Properties.

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Presentation transcript:

Splash Screen

Lesson Menu Five-Minute Check (over Lesson 3–6) Main Idea Key Concept: Multiplication Properties Example 1:Identify Multiplication Properties Example 2:Use Properties to Multiply Mentally Example 3:Use Properties to Multiply Mentally

Main Idea/Vocabulary I will use the associative and commutative properties to multiply mentally.

Key Concept

Example 1 Identify the multiplication property used to rewrite the problem. (6 × 7) × 3 = 6 × (7 × 3) The way in which the factors are grouped changed. Answer: This is the Associative Property of Multiplication. Identify Multiplication Properties

1.A 2.B 3.C 4.D Example 1 A.Commutative B.Associative C.Identity D.Distributive Identify the multiplication property used to rewrite the problem. 12 × 1 = 12

Example 2 Use Properties to Multiply Mentally Use properties of multiplication to find 8 × 15 × 5 mentally. Since you can easily multiply 8 and 5, change the order and group the numbers together. 8 × 15 × 5 = 8 × 5 × 15 Commutative Property = (8 × 5) × 15 Associative Property = 40 × 15 Find 8 × 5 mentally. = 600 Find 40 × 15 mentally.

1.A 2.B 3.C 4.D Example 2 A.390 B.400 C.430 D.445 Use properties of multiplication to find 6 × 13 × 5.

Example 3 Use Properties to Multiply Mentally Use properties of multiplication to find 67 × 25 × 4 mentally. 67 × 25 × 4 = 67 × (25 × 4) Associative Property = 67 × 100 Find 25 × 4 mentally. = 6,700 Find 67 × 100 mentally.

1.A 2.B 3.C 4.D Example 3 A.42 B.100 C.420 D.4,200 Use properties of multiplication to find 42 × 10 × 10 mentally.

End of the Lesson End Lesson

Resources Five-Minute Check (over Lesson 3–6) Image Bank Math Tool Chest Multiply Mentally

1.A 2.B 3.C 4.D Five Minute Check 1 (over Lesson 3–6) A.764 B.784 C.782 D.796 Find 46 × 17.

1.A 2.B 3.C 4.D Five Minute Check 2 (over Lesson 3–6) A.4,446 B.4,646 C.4,846 D.4,454 Find 78 × 57.

1.A 2.B 3.C 4.D Five Minute Check 3 (over Lesson 3–6) A.7,436 B.7,626 C.8,376 D.7,636 Find 92 × 83.

1.A 2.B 3.C 4.D Five Minute Check 4 (over Lesson 3–6) A.17,905 B.18,200 C.18,205 D.18,300 Find 56 × 325.

1.A 2.B 3.C 4.D Five Minute Check 5 (over Lesson 3–6) A.48,774 B.49,634 C.48,764 D.49,774 Find 607 × 82.

1.A 2.B 3.C 4.D Five Minute Check 6 (over Lesson 3–6) A.32,680 B.32,640 C.33,180 D.32,240 Find 344 × 95.

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