"Tree Planting Issues" Discovery Park PPT courseware

Description

"Tree Planting Issues" Discovery Park PPT courseware

teaching objectives

1. Combined with specific examples, go through the process of analyzing problems, answering questions, and summarizing general methods to solve tree planting problems.

2. Understand the meaning of interval numbers, know the general methods for solving tree planting problems, and be able to answer similar simple questions.

3. In the process of solving other problems using the ideas and methods of tree planting problems, gain a successful experience and feel the close connection between mathematics and life.

Explore new knowledge

The school plans to plant a row of magnolia trees in front of the 40-meter-long teaching building.

(1) If trees are planted at both ends, how many saplings need to be prepared?

Planting trees at both ends, what is the relationship between planting trees and the number of intervals?

Plant trees at both ends, and plant 1 more tree than the number of intervals.

40÷5＝8(pieces)…Number of intervals

8+1=9 (trees)… number of trees

Answer: To plant trees at both ends, you need to prepare 9 saplings.

(2) If one end is not planted and the other end is planted, how many saplings need to be prepared?

If one end is not planted, the other end is planted with trees. What does the number of intervals between planting trees matter?

If one end is not planted, the number of trees planted is equal to the number of intervals.

40÷5＝8(trees)

Answer: If one end is not planted and the other is planted, 8 saplings need to be prepared.

Discuss

In the above three ways of planting trees, what is the relationship between planting trees and the number of intervals? How to express it in formula?

(1) Plant both ends: tree = distance ÷ number of intervals + 1

(2) Only one plant: tree = distance ÷ number of intervals

(3) Don’t plant at both ends: tree = distance ÷ number of intervals – 1

The students planted trees on the same side of the 90-meter path, one every 6 meters, and one at each end. How many saplings are needed in total?

Plant at both ends: tree = distance ÷ number of intervals + 1

90÷6＝15 (pieces)

15+1=16 (tree)

Answer: A total of 16 saplings need to be prepared.

practice

1. A certain community needs to plant trees on both sides of a 52-meter-long path, one every 4 meters, and no trees at either end. How many saplings need to be prepared in total?

52÷4-1＝12 (trees)

Answer: A total of 12 saplings need to be prepared.

2. The school placed 9 pots of flowers evenly in front of the 16-meter-long classroom, placed at both ends (as shown below). How many meters are there between two pots of flowers?

16÷(9-1)＝2(meters)

Answer: There should be a distance of 2 meters between every two pots of flowers.

3. There are 7 telephone poles between Lili’s home and school, and the distance between every two telephone poles is 30 meters. How far is it from Lili's home to the school?

30×(7-1)＝180(meters)

Answer: It is 180 meters from Lili’s home to the school.

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"Mathematics in Tree Planting Problems" Discovery Park Flash animation courseware:

"Mathematics in Tree Planting Problems" Exploration Park Flash Animation Courseware This courseware belongs to the Hebei Education Edition fourth grade mathematics volume 9 unit 9 of the Exploration Park teaching material Mathematics in Tree Planting Problems Flash animation courseware, the content is vivid and vivid, please download! Keywords: Discovery Park..

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Update Time: 2024-07-08

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

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