| Category | Format | Size |
|---|---|---|
| Qingdao Edition Fourth Grade Mathematics Volume 2 | pptx | 6 MB |
"I exercise, I am healthy" PPT courseware
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"I exercise, I am healthy" PPT courseware
1. Situation introduction
Athlete No. 7 participated in 3 group matches and scored 9 points, 11 points and 13 points respectively.
Athlete No. 8 participated in 4 group matches and scored 7 points, 13 points, 12 points and 8 points respectively.
Who has a better shooting ability?
What mathematical information do you know from the picture?
2. Cooperation and exploration
Who has a better shooting ability?
Just look at how they scored in the group stages.
Athlete No. 7:
9+11+13=33 (points)
Athlete No. 8:
7+13+12 +8=40 (minutes)
40�33
Athlete No. 8 has a high level of shooting.
give it a try
The average weight of students in our group is 37 kilograms.
The average weight of students in our group is 35 kilograms.
Is Xiao Ming definitely lighter than Xiao Qiang?
uncertain.
Because the average weight represents the overall weight level of the students in the two groups and does not represent the specific weight of a certain person, it cannot be determined that Xiao Ming's weight is definitely lighter than Xiao Qiang.
3. Independent practice
1. Which group has better results?
We were a group of 3 and did 18 in total.
We were two groups of 4 people and made 20 in total.
18÷3 = 6 (pieces)
20÷4 = 5 (pieces)
Answer: The results of the second group are better.
2. There are 50 eggs in a carton. Take out 5 eggs and weigh them separately. The results are as follows:
(1) How many grams does each of these 5 eggs weigh on average?
(64＋62＋61＋65＋63)÷5
= 315÷5
= 63 (grams)
Answer: The average weight is 63 grams each.
(2) Estimate how many grams does this box of eggs weigh?
63≈60
60×50≈3000 (g)
Answer: This carton of eggs weighs approximately 3,000 grams.
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"I exercise, I am healthy" PPT courseware 7:
"I Exercise, My Health" PPT Courseware 7 How to find a more complex average problem? Zhang Qiang: (98+95+96+92+95+96+99) 7 Li Ying: (95+96+98+97+96+98+99) 7 Cui Tian: (92+94+96+95+97 +93+98) 7 Put (1.. after the correct expression)
"I exercise, I am healthy" PPT courseware 6:
"I Exercise My Health" PPT Courseware 6 For several unequal quantities, under the premise that the total number remains unchanged, by moving more to make up for the less, an equal number will be obtained. We call this equal number the average of these numbers. number. What are the characteristics of averages? 1. It is not a...
"I exercise, I am healthy" PPT courseware 5:
"I Exercise My Health" PPT Courseware 5 1. Situation Introduction The long diameter of a green turtle egg is 3.94 centimeters. Xiao Hua: the long diameter is about 3.9 centimeters. Xiao Ming: the long diameter is about 4 centimeters. Why are the results said by Xiao Hua and Xiao Ming different? Woolen cloth? The width of the green turtle egg is 2.04 cm. The green turtle egg...
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Update Time: 2024-07-04
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