0427 0428 Gr5 S C06L8HW 115024 - Weebly

Name

Numbers and Operations in Base Ten

5.NBT.5, 5.NBT.7

Lesson 8

Multiplication

Properties

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Use properties of multiplication to find (1.7 ¡Á 5) ¡Á 2.

(1.7 ¡Á 5) ¡Á 2 = 1.7 ¡Á (5 ¡Á 2)

= 1.7 ¡Á

=

17

10

Associative Property

Multiply.

Multiply.

So, (1.7 ¡Á 5) ¡Á 2 = 17.

Practice

1, 2. See students¡¯ work.

Use properties of multiplication to find each product mentally.

Show your steps and identify the properties that you used.

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1. (1.6 ¡Á 2) ¡Á 5 =

16

2. (27 ¡Á 2.5) ¡Á 4 =

270

Algebra Find each unknown.

3.  ¡Á 5.5 = 5.5

 =

1

4. 49 ¡Á 201 =  ¡Á 49

 =

201

Lesson 8 My Homework427

Problem Solving

5. For a party, Shandra and James each bought

5 packages of hot dog buns that each cost $1.50.

How much did the hot dog buns cost altogether?

$15

6. Eva needs to find: (6 ¡Á 1.5) ¡Á 2. Give the product

and name the property she could use.

HOT DO

G

18; Associative Property

7. Write a multiplication sentence to show how the Associative

Property can help you solve a problem mentally. Explain.

Sample answer: (7 ¡Á 4) ¡Á 5 = 7 ¡Á (4 ¡Á 5); It is easier to multiply

7 and 20 mentally than it is to multiply 28 and 5 mentally.

8.

2

Reason Without calculating, is the equation

¡Á

¡Á

=

(1.8 3) 2.1 3 ¡Á (1.8 ¡Á 2.1) true or false? Explain your

reasoning.

or grouped does not change the product.

Test Practice

9. Which multiplication property is shown in the equation below?

3.1 ¡Á (2 ¡Á 9) = (3.1 ¡Á 2) ¡Á 9

A

Identity Property

B

Commutative Property

C

Zero Property

D

Associative Property

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true; Sample answer: The order in which factors are multiplied

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