| Category | Format | Size |
|---|---|---|
| Hebei Education Edition Fifth Grade Mathematics Volume 1 | pptx | 6 MB |
"Solving Simple Practical Problems by Solving Equations" Equations PPT Courseware
Description
"Solving Simple Practical Problems by Solving Equations" Equations PPT Courseware
teaching objectives
1. Combined with specific examples, experience the process of finding equivalence relationships, using equations to express equivalence relationships in simple situations, and applying the properties of equations to solve equations.
2. Be able to use equations to express equivalence relationships in simple situations, and be able to use the properties of equations to solve equations.
3. In the process of analyzing problems and using equations to represent quantitative relationships in mathematical problems, understand the role of equations and gain learning experience in solving problems using equations.
Explore new knowledge
Uncle Wang is a reporter for a newspaper. After he learned to type on a computer, he could type 120 words per minute. Do you know how many words Uncle Wang writes by hand per minute?
Number of words written by Uncle Wang × 3 = 120
Solution: Suppose Uncle Wang writes x words by hand every minute.
3x=120
x＝120÷3
x=40
Answer: Uncle Wang writes 40 words per minute.
practice
1. An elephant can eat 205 kilograms of food per day, which is equivalent to 5 times what a cow eats per day. How many kilograms of food does a cow eat per day?
Solution: A cow eats x kilograms of food per day.
5x=205
5x÷5＝205÷5
x=41
Answer: A cow eats 41 kilograms of food every day.
2. The time it takes for the Earth to orbit the Sun is 13 days longer than 4 times the time it takes for Mercury to orbit the Sun. How many days does it take for Mercury to orbit the sun?
Solution: Mercury takes x days to orbit the sun.
4x+13=365
4x+13-13＝365-13
4x=352
x=88
Answer: Mercury takes 88 days to orbit the sun.
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File Info
Update Time: 2024-07-02
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