"Letters Can Represent Numbers" Integers and their addition and subtraction PPT courseware 2

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"Letters Can Represent Numbers" Integers and their addition and subtraction PPT courseware 2

Just think of a natural number between 1 and 9, multiply this number by 5 and subtract 1, then multiply the result by 2 and add 2 to the single digit.

1. First use the following children's song: "1 frog has 1 mouth, 2 eyes and 4 legs, 1 plop jumps into the water; 2 frogs have 2 mouths, 4 eyes and 8 legs, 2 plop jumps into the water; 3 frogs 3 mouths, 6 eyes, 12 legs, 3 plops into the water..." (Do you think this children's song is finished?) How many mouths, how many eyes, how many legs, how many plops do n frogs have? What about going into the water?

Use matchsticks to build the following shapes:

(1) It takes _____ matchsticks to build 2 such squares;

(2) _____ matchsticks are needed to build 3 such squares;

(3) _____ matchsticks are needed to build 4 such squares;

(4) It takes _____ matchsticks to build 100 such squares; how did you get them?

The commutative law of addition can be expressed as_______________;

The associative law of multiplication can be expressed as_______________;

The additive associative law can be expressed as ______________;

The commutative law of multiplication can be expressed as ______________;

The distributive law of multiplication can be expressed as ______________;

Exercise 1:

(1) A number is 3, and its 3 times is ____; a number is a, and its 3 times is ____; a number is a, and its n times is ____.

(2) Mingming walks to school at a speed of v meters/second; Liangliang rides a bicycle to school at a speed 3 times that of Mingming, so Liangliang’s speed can be expressed as ____ meters/second.

(3) As shown in the figure, use letters to indicate the area of ​​the shaded part in the figure:

Can you lay out the graphic below?

1. According to the figure above, how many small rods are needed to surround 4 regular hexagons?

2. How many small rods are needed to surround 100 regular hexagons? How did you calculate it?

3. If m is used to represent the number of regular hexagons, how many small rods are needed to surround m regular hexagons?

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For more information about the PPT courseware "Integers and their addition and subtraction, letters can express numbers", please click the Integers and their addition and subtraction ppt letters can express numbers ppt tag.

"Letters Can Represent Numbers" Integers and their addition and subtraction PPT courseware 3:

"Letters Can Represent Numbers" Integers and their addition and subtraction PPT courseware 3 Everyone read the following nursery rhyme and fill in the blanks. 1 frog has 1 mouth, 2 eyes and 4 legs, 1 plop jumps into the water; 2 frogs have 2 mouths, 4 eyes and 8 legs, 2 plop jumps into the water; 3 frogs___..

"Letters Can Represent Numbers" Integers and their addition and subtraction PPT courseware:

"Letters Can Represent Numbers" PPT courseware on integers and their addition and subtraction. Let's talk about a frog with 1 mouth, 2 eyes, 4 legs, and 1 plop. Two frogs have 2 mouths, 4 eyes, 8 legs, and 2 sounds. Plop into the water; three frogs with 3 mouths and 6 eyes...

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Update Time: 2024-11-20

This template belongs to Mathematics courseware Beijing Normal University seventh grade first volume mathematics industry PPT template

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