"Extension of the Law of Multiplication of Integers to Decimals" Multiplication and Division of Decimals PPT Courseware 2

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"Extension of the Law of Multiplication of Integers to Decimals" Multiplication and Division of Decimals PPT Courseware 2

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Without calculation, directly connect the equations with equal numbers in the upper and lower rows with a line.

7×12 8×( 5×4) (24+36) ×5

(8×5)×4 24×5+36×5 12×7

Ask students to think carefully about the laws of operation they used

1. Think: How do these operation laws be represented by letters?

Commutative law of multiplication: a×b=b×a

Multiplicative associative law: (a×b) ×c=a× (b×c)

Distributive law of multiplication: (a+b) ×c=a×c+b×c

a×(b+c)=a×b+a×c

2. Calculate using simple methods.

(1)125×32 (2)871×47+871×53

If you can use simple methods, use simple methods, and talk about which operation laws you use.

0.7×1.2 ○ 1.2×0.7

(0.8×0.5)×0.4 ○ 0.8×(0.5×0.4)

(2.4＋3.6)×0.5 ○ 2.4×0.5+3.6×0.5

What patterns did you discover from the above calculations?

The commutative, associative and distributive laws of integer multiplication also apply to decimal multiplication.

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"Extension of the Law of Multiplication of Integers to Decimals" Multiplication and Division of Decimals PPT Courseware 3:

"Extension of the Law of Multiplication of Integers to Decimals" Decimal Multiplication and Division PPT Courseware 3 Fill in the appropriate numbers in □: 8□=13□ 94 5=9 (□□) (32+28) 6=□ 6+□ 6 Calculate the following questions orally: 0.18.1 = 0.30.7 = 720－580= 0.20.34= ..

"Extension of the Law of Multiplication of Integers to Decimals" Multiplication and Division of Decimals PPT Courseware:

"Extension of the Laws of Multiplication Operations of Integers to Decimals" Decimal Multiplication and Division PPT Courseware Teaching Objectives 1. Knowledge Objective: Be able to skillfully apply the laws of operation of integers to decimals, and be able to perform simple calculations on decimals. 2. Ability goal: Establish everyone’s awareness of migration and be able to do...

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Update Time: 2024-10-05

This template belongs to Mathematics courseware Jiangsu Education Edition Fifth Grade Mathematics Volume 1 industry PPT template

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