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Page 1: londonshanghaimaths.files.wordpress.com€¦ · Web view2、Judge if the following equations are true. Can you explain why? a) Author: Christopher Whitehead (HABE) Created Date: 02/10/2016

Commutative Law

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Simple Calculations

True or false?

(1)7200÷24÷3 = 7200÷(24×3 ) ( )

(2)246÷6 = 246÷2÷3 ( )

Page 2: londonshanghaimaths.files.wordpress.com€¦ · Web view2、Judge if the following equations are true. Can you explain why? a) Author: Christopher Whitehead (HABE) Created Date: 02/10/2016

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 ( )