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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