Topicme3828f2eb53e82f4_1528449000663_0Topic

Units of mass

Levelme3828f2eb53e82f4_1528449084556_0Level

Second

Core curriculumme3828f2eb53e82f4_1528449076687_0Core curriculum

XII. Practical calculations. The student:

6) converts and uses appropriately units of massunits of massunits of mass: gram, decagramdecagramdecagram, kilogramkilogramkilogram, tontonton.

Timingme3828f2eb53e82f4_1528449068082_0Timing

45 minutes

General objectiveme3828f2eb53e82f4_1528449523725_0General objective

Reading and interpreting data presented in various forms and processing it.

Specific objectivesme3828f2eb53e82f4_1528449552113_0Specific objectives

1. Using appropriately units of mass: gram, decagram, kilogram, ton.

2. Converting units of mass: gram, decagram, kilogram, ton.

3. Communicating in English, developing basic mathematical, computer and scientific competences, developing learning skills.

Learning outcomesme3828f2eb53e82f4_1528450430307_0Learning outcomes

The Student:

- uses appropriately units of mass: gram, decagram, kilogram, ton;

- converts units of mass: gram, decagram, kilogram, ton.

Methodsme3828f2eb53e82f4_1528449534267_0Methods

1. Situational analysis.

2. Task contest.

Forms of workme3828f2eb53e82f4_1528449514617_0Forms of work

1. Individual work.

2. Group work.

Lesson stages

Introductionme3828f2eb53e82f4_1528450127855_0Introduction

Discussion – students name mass units they already know. They talk about situations where we can use them. They think about kinds of objects we can use to measure the mass. They notice that masses of the same line segments can be given in different units.

Procedureme3828f2eb53e82f4_1528446435040_0Procedure

The teacher divides students into four groups. Their task is to collect information obtained in the discussion.

Information students should present:

- in order to measure the mass we can use the scales,
- the most commonly used units of mass are: gram, decagram, kilogram, ton,
- in some cases we need to unify the units, that is write masses in the same units.me3828f2eb53e82f4_1527752256679_0- in order to measure the mass we can use the scales,
- the most commonly used units of mass are: gram, decagram, kilogram, ton,
- in some cases we need to unify the units, that is write masses in the same units.

Students work individually, using computers. Their task is to get to know the interactive illustration, that presents converting the units of massunits of massunits of mass.

[Interactive graphics]

Conclusions:

1 t = 1000 kg
1 kg = 100 dag
1 dag = 10 g
1 kg = 1000 g

Students take part in the individual task contest by doing exercises from 4 levels of difficulty.

Three students with the highest number of points get the highest grades, three consecutive – second highest grades.

Level 1 – each correct answer is worth 1 point

Choose the most suitable mass to the following objects.

1) The mass of the letter is:
A. 12 kg
B. 12 t
C. 12 g
D. 12 dag

2) The mass of the book is:
A. 23 kg
B. 23 t
C. 23 g
D. 23 dag

3) The mass of the table is:
A. 8 kg
B. 8
C. 8 g
D. 8 dag

4) The mass of the bus is:
A. 8 kg
B. 8 t
C. 8 g
D. 8 dag

Level 2 – each correct answer is worth 2 points

Choose the correct answer:

1) 7 dag is:
A. 70 kg
B. 70 t
C. 700 g
D. 70 g

2) 30 kg is:
A. 300 dag
B. 3000 dag
C. 300 g
D. 3000 g

Level 3 – each correct answer is worth 3 points

Do the exercises using the formula.

The formula:

[Illustration 1]

1) 14 kg 14 dag is:
A. 14140 dag
B. 1414 dag
C. 14140 g
D. 1414 g

2) 54 dag 30 g is:
A. 5430 dag
B. 5403 dag
C. 543 g
D. 570 g

Level 4 – each correct answer is worth 4 points

Mark a correct answer:

1) 350 dag is:
A. 3 kg 5 dag
B. 30 kg 5 dag
C. 3 kg 50 dag
D. 30 kg 50 dag

2) 18053 kg is:
A. 180 t 53 kg
B. 18 t 530 kg
C. 185 t 3 kg
D. 18 t 53 kg

The teacher grades the students’ work and clarifies doubts.

An extra task:

There are names on the packages of food products:

- netto – mass of the article without the package,
- brutto – mass of the article with the package,
- tare – mass of the package.

There is a can with the peas with a sign „netto mass 42 dag”.

Calculate the brutto mass of the can with peas, if the tare is 40 g.

Lesson summaryme3828f2eb53e82f4_1528450119332_0Lesson summary

Students do the revision exercises. Then together they sum‑up the classes, by formulating the conclusions to memorise:

The most commonly used units of mass are: gram, decagram, kilogram, ton.
1 t = 1000 kg
1 kg = 100 dag
1 dag = 10 g
1 kg = 1000 g
There are names on the packages of food products:
netto – mass of the article without the package,
brutto – mass of the article with the package,
tare – mass of the package.me3828f2eb53e82f4_1527752263647_0The most commonly used units of mass are: gram, decagram, kilogram, ton.
1 t = 1000 kg
1 kg = 100 dag
1 dag = 10 g
1 kg = 1000 g
There are names on the packages of food products:
netto – mass of the article without the package,
brutto – mass of the article with the package,
tare – mass of the package.

Selected words and expressions used in the lesson plan

units of massunits of massunits of mass

tontonton

kilogramkilogramkilogram

decagramdecagramdecagram

binomial expressionbinomial expressionbinomial expression

monomial expressionmonomial expressionmonomial expression

denominationdenominationdenomination