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Commutative Law
D
Simple Calculations
True or false?
(1)7200÷24÷3 = 7200÷(24×3 ) ( )
(2)246÷6 = 246÷2÷3 ( )
1、True or false?
(1) 56+38=83+56 is using the commutative law of addition. ( )
(2) 2×3=1×6 is using the commutative law of multiplication. ( )
(3) A×B=B + A ( )
(4) □+ +○= □+○+△ △ ( )
Associative Law Which number sentence conforms to the associative law?
(1)a×(b×c)=(a×b)×c
(2) 15+(7+3)=(15+2)+3
(3)(23+41)+72+28=23+41+(72+28)
Distributive Law True or False.
(1)(22+17)×35=22×35+17×35 ( )
(2)78×91+91×25=(78+25)×91 ( )
(3)74×(20+1)= 74×20+74 ( )
(4)58×91+91×25=58+25×91 ( )
(5)8×(125×9)=8×125×8×9 ( )
Distributive Law Without calculating decide if the following are true or false and then explain the reason.
(a)(22-17)×35=22×35-22×17 ( )
(b)78×91+91×25=78+25×91 ( )
(c) 8×(11×9)=8×11×8×9 ( )
Properties of division True or false
(1)100÷(25×4)=100÷25×4 ( )
(2)40÷(4×5)=40÷4×5 ( )
(3) 54÷(3×3)=54 ÷3 ÷3 ( )
Simple Calculations
True or false?
(1)7200÷24÷3 = 7200÷(24×3 ) ( )
(2)246÷6 = 246÷2÷3 ( )