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

Description

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

Everyone read the following children's song together and fill in the blanks.

1 frog has 1 mouth, 2 eyes and 4 legs, and jumps into the water with 1 plop;

2 frogs with 2 mouths, 4 eyes and 8 legs jumped into the water with 2 plops;

3 frogs ___ mouth, ___ eyes, ___ legs, ___ plop into the water;

4 frogs ___ mouth, ___ eyes, ___ legs, ___ plop into the water;

n frogs ___ open their mouths, ___ eyes ___ legs, and jump into the water with a ___ plop;

Use matchsticks to build the square as shown in the picture

1. It takes ____ matchsticks to build a square.

2. It takes ____ matchsticks to build two squares

3. It takes ____ matchsticks to build three squares

According to the above figure, how many matchsticks need to be added for each additional square?

Think and discuss

(1)How many matchsticks are needed to build 100 squares? ( )

(2)How many calculation methods do you have? Are there any other calculation methods? group discussion

(3) If X is used to represent the number of squares to be built, then how many matchsticks are needed to build X such squares.

discuss:

(1) What does X represent in 4+3(X-1), X+X+(X+1), 1+3X, 4X-(X-1).

(2) Write down the formulas for the perimeter and area of ​​figures represented by letters that you know and the arithmetic laws represented by letters. (Write two of each) and point out the numbers represented by the letters.

(3) To build 200 squares, can you quickly and accurately find the required number of roots using a simple and clever method?

Reflection and Summary

(1) What can the letters represent?

(2) Be able to use letters to express previously learned operational laws and calculation formulas;

(3) The process of exploring laws and expressing them with algebraic expressions.

Keywords: integers and their addition and subtraction courseware, letters can represent numbers courseware, Beijing Normal University edition seventh grade mathematics volume PPT courseware, seventh grade mathematics slide courseware download, integers and their addition and subtraction PPT courseware download, letters can represent numbers PPT courseware Download, .ppt format

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

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

"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. how many. 1. First use the following children's song: 1 frog, 1 mouth, 2 eyes...

"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...

File Info

Update Time: 2024-07-11

This template belongs to Mathematics courseware Beijing Normal University Edition Seventh Grade Mathematics Volume 1 industry PPT template

Preview