Commutative Law

1. Fill in the blanks by using the commutative law of addition

256＋214= ＋256 X+Y= ＋X

△+☆= ＋ 十 367=367 ＋

2、Fill in the blanks by using the commutative law of multiplication

34 × 71= （ ）× （ ） 45× （ ）=55× （ ）

（ ）× =▲ （ ）× ■ （ ）× （ ）=C×D

2、Fill in the blanks by using the commutative law

52× （ ）=141 × （ ）

55+87+45=55+ （ ）+87

+☆ （ ）=●+ （ ）

25×18×4= （ ）× （ ）× （ ）

×△ （ ）× =★ （ ）× ×○ ★

Associative Law

1、Fill in the blanks by using the associative law of addition` ```````` -`

（33＋16）＋84=____＋（16＋____）

（168＋24）＋76=____＋（____＋____）

（25＋____）＋72=____＋（28＋72 ）

（a＋____）＋c=a＋（b＋____）

2、Fill in the blanks by using the associative law of multiplication

36×71×26= （ ____ × _____ ）×26

57×95×83=57× （ ____ × ____ ）

●× × =___ ×▲ ★ （▲× __ ）= （ ___ × ▲）× ____

Applications of the Laws

3、Fill in the blanks by using the associative law

(1)25＋34＋66=___ ＋（ ___＋____ ）

(2) 25×40×78= （ ____ × ____ ）×78

(3) 56＋72＋44= （ ___＋____ ）＋72

(4)75×8×2×125= （ ____ × ____ ）× （ ____ × ____ ）

Distributive Law

.Fill in the blankets according to distributive law of multiplication

（1）（100＋3）×24= 100×_____＋3×______

（2）（85＋13）____×=29×_____＋29×_____

（3）98×47+2×47==（_____ +______）×47

（4）74×25+74×5=_____×(______+______）

（5 ○） ×□+○× =_____×△ （_____+______）

Distributive Law 2

1.Fill in the blanks by using the distributive law of multiplication .

(1)（93＋28）×11=93× ＋ ×28

(2) 20×（80－10）=20× －20×

(3) ×◆ ★—●×★=（ ＋ ）×

The properties of division

1) Fill in the missing operation

2) Fill in the right number in the box

Simple Calculations

Fraction and divisionExercise 1

1 The wood stick is divided into 4 equal parts. One part is of the wood stick.

2 A packet of biscuits is divided into 2 people on average. Everyone will share package.

3 Divide 9 bananas into 3 equal parts. One part is ( ) bananas. One part is of these bananas. Exercise 2 Try to fill in the blanks

(1) ( )÷7= 47

(2) 1÷( )=1

3

(3 ) 79=( )÷9

(4 ) 5

8=( )÷( )

Equivalent fractions

1、Fill in the blanks

a)

915

=3×()5×() b)

29=8÷()36÷() c)

5×()2×()

=35( ) d)

15÷()20÷()

=( )4

2、Fill in the bracket with an integer. Explain the reason for your choice.

a) 14=

( )12 b)

420

= 8( ) c)

30( )

=65 d)

3624

=( )8

3)

Reciprocal fractions