Topicm45adc6c52f076934_1528449000663_0Topic

Compare (Difference Unknown) problems. How many more? How many fewer?

Levelm45adc6c52f076934_1528449084556_0Level

Second

Core curriculumm45adc6c52f076934_1528449076687_0Core curriculum

I. Natural numbers in the decimal numeral system. Student:

3) compares natural numbers.

II. Activities on natural numbers. Student:

6) compares natural numbers using their difference or quotient.

Timingm45adc6c52f076934_1528449068082_0Timing

45 minutes

General objectivem45adc6c52f076934_1528449523725_0General objective

Performing uncomplicated calculations in memory or in writing in case or more difficult tasks and using these skills in practical situations.

Specific objectivesm45adc6c52f076934_1528449552113_0Specific objectives

1. Comparing natural numbers using their differences.

2. Using Compare (Difference Unknown) to solve word problems.

3. Communicating in English, developing mathematical, scientific, technical and IT competences, developing learning skills.

Learning outcomesm45adc6c52f076934_1528450430307_0Learning outcomes

The student:

1. Student compares natural numbers using their differences.

2. Student applies Compare Difference to solve word problems.

Methodsm45adc6c52f076934_1528449534267_0Methods

1. Discussion.

2. Task‑based stations.

Forms of workm45adc6c52f076934_1528449514617_0Forms of work

1. Whole class.

2. Group work.

Lesson stages

Introductionm45adc6c52f076934_1528450127855_0Introduction

The teacher asks students to stand up only:

- if they have more than 15 friends,

- if they fewer than 10 TV programs,

- if they have more than two pets at home,

- if they have read more than 5 books this month,

- if they have fewer than 8 coloring pencils in their pencil case.

Discussion - What math skills were needed to correctly follow teacher's instructions? What mathematical relations were used?

The students review the following terms: a greater numbergreater numbergreater number, a smaller number. They solve the task to consolidate these concepts.

Task

Write the appropriate sign in the blank space: <, > or =.

a) 12 ....... 14

b) 59 ........ 57

c) 100 ....... 63

d) 4 ......... 45

e) 124 ....... 42

Procedurem45adc6c52f076934_1528446435040_0Procedure

Students work individually using computers. They open SLIDESHOW and watch examples of „how many moreHow many morehow many more?”, „how many fewerHow many fewerhow many fewer?”.

Their task is to match the appropriate actions to the presented situations.

After the exercise, students present their conclusions.

[SLIDESHOW ]

Conclusionsm45adc6c52f076934_1527752256679_0Conclusions

- If there is a „how many more” phrase in the problem, we do the addition to solve the word problem.m45adc6c52f076934_1527752256679_0- If there is a „how many more” phrase in the problem, we do the addition to solve the word problem.

- If there is a „how many fewer” phrase in the problem, we perform the subtraction to solve the word problem.m45adc6c52f076934_1527752256679_0- If there is a „how many fewer” phrase in the problem, we perform the subtraction to solve the word problem.

Task stations

Students work using the task station method. They solve word problems prepared by the teacher in different groups.

Each group receives points for correctness and the speed of solving the problems.

Members of the best and quickest group receive excellent grades.

Station 1. Task 1

Complete the table.m45adc6c52f076934_1527752263647_0Complete the table.

[Table 1]

Station 2. Task 2

Complete the table.m45adc6c52f076934_1527752263647_0Complete the table.

[Table 2]

Station 3. Task 3

Complete the sentence.

a) The number 5 greater than 16 is .........

b) The number 32 greater than 48 is ........

c) The number 16 less than 59 is ........

d) The number 14 greater than 68 is .........

Station 4. Task 4

The average body heights of selected dog breeds are marked in the picture. The dogs presented are: Bernardine, German Shepherd, Dalmatian, Dachshund, Pug and York.

 [Illustration 1]

1. How many centimeters is York is shorter than a German Shepherd?

2. How many centimeters is a Dachshund taller than a Pug?

3. How many centimeters is the Dalmatian shorter than the Bernardine?

4. How many centimeters is the German Shepherd taller than a Dachshund?

Station 5. Task 5

Solve each of the word problems. Write down all the calculations and the solution.

1. Piotrek's uncle’s car uses 10 liters of petrol per 100 km, and Piotr's father’s car uses 2 less. How many liters of fuel per 100 km does Piotr's dad’s car use?

2. Tomek is 12 years old and his mother is 23 years older than him. How old is Tomek's mom?

3. Zosia has 230 PLN savings. How much less did Krzys save if he has 150 PLN in his money box?

4. 54 bottles of juice were sold in the school shop on Monday. On Tuesday, the shop sold three bottles fewer than on Monday, and on Wednesday, five greater than on Tuesday. How many bottles of juice were sold during these three days?

The groups present their results. The teacher explains the doubts, assesses the work.

Task for volunteers

Wojtek is two years older than Maciek, and Maciek a year older than Kuba. Wiktor is two years younger than Kuba, and Antek four years younger than Kuba.

The boys are 58 years old together. How old is Kuba? Write down all the calculation and the solution.

Lesson summarym45adc6c52f076934_1528450119332_0Lesson summary

Students do revision exercises.

Then, they summarize the lesson together, formulating information to remember:

- if in the problem there is a phrase „how many moreHow many morehow many more”, then to solve the problem we perform the additionadditionaddition

- if there is a „how many fewerHow many fewerhow many fewer” phrase in the problem, we perform the subtractionsubtractionsubtraction to solve the problem.

Selected words and expressions used in the lesson plan

additionadditionaddition

greater numbergreater numbergreater number

how many fewerHow many fewerhow many fewer

how many moreHow many morehow many more

subtractionsubtractionsubtraction