"Using letters to express quantitative relationships" Equation PPT courseware 2

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"Using letters to express quantitative relationships" Equation PPT courseware 2

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1. What are the advantages of using letters to represent numbers? But what to pay attention to?

Using letters to express numbers is concise, easy to remember and easy to apply. But when the multiplication sign is omitted, the number is usually written before the letter.

2. Use S to represent the area, C to represent the perimeter, a to represent the side length, and b to represent the width. Write the formulas for the area and perimeter of the rectangle and square.

S= a b C=（ a+ b）×2 S= a² S=4 a

3. In the following formulas, which operation symbols can be omitted? If you can omit it, omit it and write it down.

a×7 14＋b a÷7 a×a 5－x 0.6×0.6

The tablemates discussed using an expression to express the father’s age in any year.

1. Xiaohong’s age + 30 years old = dad’s age

2.a+30

Which representation do you prefer and why?

What does a in a+30 mean? What does 30 mean? What does a+30 mean?

a represents Xiaohong’s age

30 means the father is older than Xiaohong

a+30 represents father’s age

Think about it and fill it in.

(1) A copy of "Lectures" costs a yuan, and buying a copy of b costs a total of ( ) yuan.

(2) Lili’s height this year is a centimeter, which is 3 centimeters more than last year. Last year’s height was ( ) centimeters.

(3) The side length of the square is a decimeter, 4a represents ( ), and a² represents ( ).

(4) In the school sports meeting, the fourth grade students won a gold medal and the fifth grade students won 18 gold medals.

①Two grades received a total of ( ) cards.

②a-18 means ( )

③a÷18 means ( )

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"Using letters to express quantitative relationships" equation PPT courseware:

"Using Letters to Express Quantitative Relationships" Equation PPT Courseware 1. Which operation symbols can be omitted in the following equations? What does it look like if you omit it and write it out? 4 5 b 6 52 + x a 7 X X 14�C ... ... ... Dad said: I am 30 years older than Xiaohong. From this sentence...

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Update Time: 2024-09-10

This template belongs to Mathematics courseware Western Normal University Edition Fifth Grade Mathematics Volume 2 industry PPT template

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