"Formulas and Equations" PPT

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"Formulas and Equations" PPT

Part One Content: Classroom Introduction:

WC, km, kg, S=(a+b)h÷2, a+b= b+a……

Using letters to represent numbers is simpler and clearer.

Newly awarded

Use letters to express quantitative relationships

Use letters to represent the laws of operations

Use letters to express calculation formulas

An equation with unknown numbers is called an equation.

The solution to an equation is the value of the unknown that makes the left and right sides of the equation equal.

The process of finding the solution to an equation is called solving the equation.

Formulas and Equations PPT, Part 2: Classroom Exercises

Give it a try:

(1) Xiaoping kicked 42 shuttlecocks in the shuttlecock kicking competition. The number of shuttlecocks she kicked was 3/4 of Xiaoyun's. How many times did Xiaoyun kick?

The number of Xiaoyun's kicks × 3/4 = the number of Xiaoping's kicks

(2) The experimental survival rate of a kind of sapling is 98%. In order to ensure the survival of 380 saplings, how many saplings must be planted?

Number of saplings × 98% = 380 surviving saplings

(3) The greening team planted flowers for a residential community. Plant 240 roses, plus 16, which is twice the number of lilacs planted. How many lilacs have been planted?

Lilac × 2 = 240 roses + 16 roses

fill in the blank:

1. The school originally had 8140 books, and another one was purchased. Now the school has a total of ( ) books.

2. Car A transports a ton of cargo, and car B transports b ton of cargo. The two cars transport a total of ( ) tons of cargo.

3. A person can walk a kilometer per hour, ( ) kilometer in 5 hours, ( ) kilometer in 7 hours, and it takes ( ) kilometer in S kilometer.

4. Pencils cost a yuan each and exercise books cost b yuan. Xiaohong bought 8 pencils and 5 exercise books, paying a total of ( ) yuan.

Formulas and equations PPT, the third part of the content: after-class summary:

(1) Use letters to express numbers

Letters can be used to express numbers, quantitative relationships, operating laws, calculation formulas, etc.

In formulas containing letters, when multiplying numbers and letters, letters and letters, the multiplication sign can be written as "·" or omitted, and the numbers are written in front of the letters.

(2) Equation

An equation with unknown numbers is called an equation.

The solution to the equation is to make the left and right sides of the equation equal

The value of the unknown.

The process of finding the solution to an equation is called solving the equation.

(3) Solving problems using equations

1. Review the question and explain the meaning of the question;

2. Find the equivalent relationship;

3. Write hypothesis sentences and list equations based on equivalence relationships;

4. Solve the equation and write the answer;

5. Inspection.

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For more information about the "Equations and Equations" PPT courseware, please click on the "Equations and Equations" PPT tab.

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"Equations and Equations" general review PPT courseware ① Formulas containing letters: a+b, a-486, 8X, etc. ② Inequalities: 3+5＞7, 1+3＜5, 5a-40＞16, etc. ③ Equations : For example: 1+2=3, 99+1=100, 4X=24, 8x-4.8x=1.6, etc. ④ Equation: 4X=24..

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Update Time: 2024-11-04

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