"Encounter Problem" Use Equations to Solve Problems PPT

Description

"Encounter Problem" Use Equations to Solve Problems PPT

Part One: Learning Objectives

1. Be able to analyze quantitative relationships in simple practical problems and be able to use equations to solve encounter problems. (emphasis)

2. Identify equivalence relationships and parallel equations. (difficulty)

Encountering Problems PPT, Part 2: Exploring New Knowledge

Knowledge points Use equations to solve encounter problems

The distance from Naughty’s house to Xiaoxiao’s house is 840m, and they both set off from home at the same time.

(1) Where do you think the two met?

(2) How long did it take for Naughty and Xiaoxiao to meet after they set off?

The distance traveled by Naughty + the distance walked by Xiaoxiao = 840 meters

Naughty speed × time + Xiaoxiao speed × time = 840 meters

Knowledge refining

To solve equations of the form ax±bx=c, we must solve them according to the distributive law of multiplication and the properties of equations.

When solving the encounter problem, the equation can be solved by using the equivalent relationship "speed sum × encounter time = distance sum".

Encounter problems PPT, the third part: consolidation exercises

1. Uncle Zhang wants to deliver a document to Aunt Wang. They agree to drive off at the same time. The park is 50km away from the overpass. (Selected from textbook P72 T1)

(1) Where do they estimate they met? Mark it on the picture and share your thoughts with a partner.

(2) When will we meet after departure? How far is the meeting point from the park? Solve problems using equations.

2. Solve the equation. (Selected from textbook P72 T3)

3. There is a 5,700-word document. Due to time constraints, two typists A and B are arranged to start typing at the same time. How long does it take to record this document? (Selected from textbook P72 T4)

Solution: It takes x minutes to complete recording this document.

100x+90x＝5700

x=30

Answer: It takes 30 minutes to finish recording this document.

Encounter problems PPT, part 4 content: Class summary

What knowledge have you learned in this class?

To solve equations of the form ax±bx=c, we must solve them according to the distributive law of multiplication and the properties of equations.

When solving the encounter problem, the equation can be solved by using the equivalent relationship "speed sum × encounter time = distance sum".

Encounter problems PPT, part 5: homework

Assignment 1: Complete the exercises related to the textbook.

Assignment 2: Complete the corresponding exercises.

Keywords: Free download of Beijing Normal University version of fifth grade mathematics volume 2 PPT courseware, PPT download of encounter problems, PPT download of solving problems with equations, .PPT format;

For more information about the PPT courseware "Using Equations to Solve Problems and Encounter Problems", please click the Use Equations to Solve Problems PPT Encounter Problems PPT tag.

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Update Time: 2024-10-12

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