Topicmdfba777a3108e7d5_1528449000663_0Topic

Multiplying the common fractions

Levelmdfba777a3108e7d5_1528449084556_0Level

Second

Core curriculummdfba777a3108e7d5_1528449076687_0Core curriculum

IV. Common and decimal fractions. The student:

3) reduces and expands the common fractioncommon fractioncommon fraction,

5) presents the improper fraction in a, and the mixed numbermixed numbermixed number in a form of improper fraction.

V. The operations on the common and decimal fractions. The student:

1) adds, subtracts, multiplies, divides the common fractions with the one or two‑digit denominators, and mixed numbers.

Timingmdfba777a3108e7d5_1528449068082_0Timing

45 minutes

General objectivemdfba777a3108e7d5_1528449523725_0General objective

Matching a mathematical model to a simple situation and using it in various contexts.

Specific objectivesmdfba777a3108e7d5_1528449552113_0Specific objectives

1. Multiplying the common fractions.

2. Solving the tasks using the multiplication of the fractionsmultiplication of the fractionsmultiplication of the fractions.

3. Communicating in English; developing mathematical and basic scientific, technical and digital competences; developing learning skills.

Learning outcomesmdfba777a3108e7d5_1528450430307_0Learning outcomes

The student:

- multiplies the common fractions using the reducing,

- calculates the squares and the cubes of the common fractions.

Methodsmdfba777a3108e7d5_1528449534267_0Methods

1. Show.

2. Situational analysis.

Forms of workmdfba777a3108e7d5_1528449514617_0Forms of work

1. Individual work.

2. Class work.

Lesson stages

Introductionmdfba777a3108e7d5_1528450127855_0Introduction

The students revise the notion of the square and the cube of the natural numbernatural numbernatural number.

- The square of the natural number is the productproductproduct of two identical factors.

- The cube of the natural number is the product of three identical factors.

Proceduremdfba777a3108e7d5_1528446435040_0Procedure

The teacher informs the students they are going to learn about the method of multiplying the common fractions and calculating their squares and cubes.

[Slideshow]

The students watch the slideshow. They are going to watch the method of multiplying the common fractions and complete the task om their own.

Task

Calculate:

a) 27·59

b) 49·13

c) 57·49

d) 57·38

The students discuss the results and draw a conclusion:

- When we multiply the common fractions we multiply the numerator by the numerator and the denominator by the denominator.

Task

The students do the calculations reducing the fractions:

a) 37·1418

b) 38·49

c) 3370·1011

After completing the task the students come up the conclusion:

- We try to write the result of the multiplication in the simplest formsimplest formsimplest form.

Task

The students calculate the squares and the cubes of the fractions:

a) 272

b) 123

c) 252

d) 233

They draw the conclusion:

- The square of the common fraction is the product of two identical fractions.
- The cube of the common fraction is the product of three identical fractions.
mdfba777a3108e7d5_1527752263647_0- The square of the common fraction is the product of two identical fractions.
- The cube of the common fraction is the product of three identical fractions.

An extra task

The area of the Pacific Ocean equals about  12 of the area of all the seas. The lands are about 310 of the area of the Earth. Does the Pacific Ocean take more surface than 14 of the area of Earth?

Lesson summarymdfba777a3108e7d5_1528450119332_0Lesson summary

The students do the summarising tasks.

Then they sum up the class drawing the conclusions to memorise:

- When we multiply the common fractions we multiply the numerator by the numerator and the denominator by the denominator.mdfba777a3108e7d5_1527752256679_0- When we multiply the common fractions we multiply the numerator by the numerator and the denominator by the denominator.

- The square of the common fractioncommon fractioncommon fraction is the productproductproduct of two identical fractions.

- The cube of the common fraction is the product of three identical fractions.

Selected words and expressions used in the lesson plan

productproductproduct

common fractioncommon fractioncommon fraction

natural numbernatural numbernatural number

mixed numbermixed numbermixed number

reducible fractionreducible fractionreducible fraction

irreducible fractionirreducible fractionirreducible fraction

multiplication of the fractionsmultiplication of the fractionsmultiplication of the fractions

simplest formsimplest formsimplest form

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common fraction1
common fraction

ułamek zwykły

R1Qf7Cav6mfih1
wymowa w języku angielskim: common fraction
mixed number1
mixed number

liczba mieszana

RqWTJvXrpAhP41
wymowa w języku angielskim: infrasound
multiplication of the fractions1
multiplication of the fractions

mnożenie ułamków

RWLNMMXi5XWPa1
wymowa w języku angielskim: multiplication of the fractions
natural number1
natural number

liczba naturalna

R1MEfKqARFQJu1
wymowa w języku angielskim: natural number
product1
product

Iloczyn

R1LGPNV0IbgNj1
wymowa w języku angielskim: product
simplest form1
simplest form

najprostsza postać

R5dOvf8sWhVX41
wymowa w języku angielskim: simplest form
reducible fraction1
reducible fraction

ułamek skracalny

Rhl3gYBE6nLCN1
wymowa w języku angielskim: reducible fraction
irreducible fraction1
irreducible fraction

ułamek nieskracalny

R1JkmnWtSZ9sY1
wymowa w języku angielskim: irreducible fraction