"Representing Numbers with Letters" PPT Courseware 2

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"Representing Numbers with Letters" PPT Courseware 2

Math Applications

Example 1 Use a formula containing letters to express:

(1) There are n students in a seventh-grade class, among which there are m boys. How many girls are there?

(2) There are a number of girls in a class of seventh grade, and there are twice as many boys as girls. How many boys are there?

(3) The distance from Xiaoliang’s home to school is 2 kilometers. The speed of Xiaoliang’s bicycle ride is a kilometer/hour. How long does it take for Xiaoliang to ride his bicycle from home to school?

(4) Two people A and B start from A and B at the same time and go towards each other. A's speed is a km/h, B's speed is b km/h, and they meet when they pass 2, then A, What is the distance between place B?

Important conclusions

1. When multiplying numbers and letters, the multiplication sign can be omitted and the numbers are written in front of the letters.

If the number is a mixed number, it should be written as an improper fraction.

2. To multiply letters by letters, use dot multiplication or omit the multiplication sign.

3. In division equations, use fraction lines instead of division signs.

4. When the result is in the form of sum or difference, the formula should be enclosed in brackets and the name of the unit should be written.

5. When using letters to represent numbers, pay attention to the actual meaning of the letters.

math experiment

Please use square pieces of paper of the same size to form a large square as follows. Observe carefully and look for patterns:

The (1) picture has _____ small squares;

The (2) picture has _____ small squares;

The (3) picture has _____ small squares;

The (4th) picture has _____ small squares

The (n)th picture has _____ small squares.

How many more small squares does the latter figure have than the previous one?

Class summary

Let’s talk about it:

What did we gain from today’s lesson?

1. We can use letters to represent numbers

2. The advantage of using letters to represent numbers is: simplicity and convenience

3. Rules or issues that should be paid attention to when using letters to represent numbers

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For more information about the PPT courseware "Using Letters to Represent Numbers", please click the Use Letters to Represent Numbers ppt tag.

"Review of Representing Numbers with Letters" PPT:

"Review of Using Letters to Represent Numbers" PPT Part One: Teaching Objectives 1. Review and organize the knowledge about using letters to express numbers in primary school. Through review, students can use letters to represent numbers in specific situations. Ability to use letters to represent operational rules and calculations..

"Using Letters to Represent Numbers" PPT:

"Representing Numbers with Letters" PPT Part One Content: Scenario introduction 1 frog 1 mouth 2 frogs 2 mouths 3 frogs 3 mouths.. N frogs ( ) mouths Example 1. Use expressions containing letters to express Yaya and Niuniu age relationship. When Niuniu was 1 year old, Yaya (1+3...

"Using Letters to Represent Numbers" PPT Courseware 7:

"Representing Numbers with Letters" PPT Courseware 7 The unit price of exercise books is a yuan. How to express the total price of 100 exercise books? Because the total price of exercise books = the number of exercise books x unit price, the total price of 100 exercise books is 100xa yuan is 100a yuan. Numbers are related to the letters that represent numbers...

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Update Time: 2024-11-21

This template belongs to Mathematics courseware Qingdao Edition Seventh Grade Mathematics Volume 1 industry PPT template

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