Topicm02bac13e3e667f31_1528449000663_0Topic

Rounding decimal fractions

Levelm02bac13e3e667f31_1528449084556_0Level

Second

Core curriculumm02bac13e3e667f31_1528449076687_0Core curriculum

IV Common and decimal fractions. The student:
11) rounds the decimal fraction.

Timingm02bac13e3e667f31_1528449068082_0Timing

45 minutes

General objectivem02bac13e3e667f31_1528449523725_0General objective

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

Specific objectivesm02bac13e3e667f31_1528449552113_0Specific objectives

1) RoundingroundingRounding the decimal fractions.

2) Solving the text task using roundingroundingrounding of the decimal fractions.

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

Learning outcomesm02bac13e3e667f31_1528450430307_0Learning outcomes

The student:

- rounds the decimal fractions to the row given;

- solves the text task using roundingroundingrounding of the decimal fractions.

Methodsm02bac13e3e667f31_1528449534267_0Methods

1) Class game.

2) Situational analysis.

Forms of workm02bac13e3e667f31_1528449514617_0Forms of work

1) Individual work.

2) Pair work.

3) Class work.

Lesson stages

Introductionm02bac13e3e667f31_1528450127855_0Introduction

Students prepare and bring the cards with the numbers: 0.25; 0.4; 4.3; 46.84; 4.975; 0.9754; 123.432.

The students give the examples of the roundingroundingrounding the natural numbers with given accuracy. They revise the rules of roundingroundingrounding.

Procedurem02bac13e3e667f31_1528446435040_0Procedure

The teacher introduces the topic of the lesson: roundingroundingrounding the decimal fractions.

[Slideshow]

Task 1
The students work individually using their computers. They are going to watch the method of roundingroundingrounding the decimal fractiondecimal fractiondecimal fraction to the given row and to draw the conclusion.

Conclusion:
We round the decimal fractions (written in decimal form)using the same rule as roundingroundingrounding the natural numbers.

Task 2
The students round the fractions to the units.

a) 0.4

b) 3.64

c) 23.541

Task 3
The students round the numbers to the given row and specify if they round up or round down.

a) roundingroundingrounding units
12.456
3.7

b) roundingroundingrounding to tens
45.8219
98.599

c) roundingroundingrounding to hundredths
2,903
0.277

d) roundingroundingrounding to thousandths
1.8967
0.0004

The students work in pairs.
They use the cards they have prepared at home. One person draws the card the other gives the row which the drawn number belongs to. The student gets a point when he rounds the number correctly. An extra point is given when he specifies if it’s rounding uprounding uprounding up or rounding downrounding downrounding down. Next, the students change the roles and repeat the activity for few times.
The winner is the person with the largest number of points.

Task 4
The students round given numbers with an accuracy to given row.

a) 2.5(6) to hundredths

b) 1.(39) to thousandths

An extra task
Give the 2Indeks górny nd^nd decimal of the decimal number equal to the common fraction of $\frac{4}{11}$. Round the decimal fraction to tens.m02bac13e3e667f31_1527752256679_0Give the 2Indeks górny nd^nd decimal of the decimal number equal to the common fraction of $\frac{4}{11}$. Round the decimal fraction to tens.

Lesson summarym02bac13e3e667f31_1528450119332_0Lesson summary

The students do the summarising tasks.
Then they sum up the class drawing the conclusions to memorise:
- We round the decimal fractions (written in decimal form)using the same rule as rounding the natural numbers.m02bac13e3e667f31_1527752263647_0We round the decimal fractions (written in decimal form)using the same rule as rounding the natural numbers.

Selected words and expressions used in the lesson plan

decimal fractiondecimal fractiondecimal fraction

roundingroundingrounding

rounding uprounding uprounding up

rounding downrounding downrounding down