"Using Averages to Solve Practical Problems" Average and Bar Chart PPT Courseware

Description

"Using Averages to Solve Practical Problems" Average and Bar Chart PPT Courseware

teaching objectives

1. Combined with specific examples, go through the process of understanding data information, estimation, using a calculator to calculate averages and discussing the meaning of averages.

2. Further understand the role of averages, be able to calculate averages, and explain their practical significance in your own language.

3. In the process of estimating average height and using averages to describe specific things, develop number sense and realize the close connection between mathematics and daily life.

Explore new knowledge

(1) Use a calculator to calculate the average height of the players on both teams.

Red Star: (153+138+153+163+165+158+166+168+158)÷9=158 (cm)

Galaxy: (152+172+140+140+154+160+167+161+167)÷9=157 (cm)

1. Is the average height calculated the height of each team member?

2. Can the height of a certain player represent the average height of the entire team?

3. How many centimeters does the tallest player exceed the average height of the team?

4. How many centimeters is the shortest player below the average height of the team?

(2) Use a calculator to calculate the average weight of the players of the two teams.

Red Star: (47+35+45+54+53+51+56+56+53)÷9=50 (kg)

Galaxy: (48+58+40+42+50+56+52+50+45)÷9=49 (kg)

Is there any relationship between the average weight and average height of the players on both teams?

Consolidate application

practice

1. The tree planting situation of students in six groups of Class 4 (2) of Xinhua Primary School is as follows:

(1) How many trees does each group plant on average?

(21+23+23+25+24+22)÷6=23 (tree)

Answer: On average, each group plants 23 trees.

(2) How many trees does each person in the class plant on average?

(21+23+23+25+24+22)÷(7+7+8+8+8+9)=3 (tree)

Answer: On average, each person in the class planted 3 trees.

2. There are 6 elderly people in Sunset Red Nursing Home. Their ages are 75, 82, 94, 85, 77, and 91 years old respectively. What is their average age?

(75+82+94+85+77+91)÷6=84 (years old)

Answer: Their average age is 84 years old.

3. A long-distance bus travels from the departure station to the destination for 5 hours. The following table shows the distance traveled by the bus per hour:

Do the math: How many kilometers per hour does this coach travel?

(81＋82＋87+86+84)÷5＝84 (km)

Answer: This long-distance bus travels 84 kilometers per hour.

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File Info

Update Time: 2024-10-05

This template belongs to Mathematics courseware Hebei Education Edition Fourth Grade Mathematics Volume 1 industry PPT template

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