# Length – Non Standard and Non Standard Measurement | Measuring in Centimetres and Metres | Real Life Application | Counting 841 – 860 Primary 3 (Basic 3) Term 3 Week 2 Mathematics

### MATHEMATICS

THIRD TERM

WEEK 2

PRIMARY 3

THEME – PRIMARY MEASUREMENT

PREVIOUS LESSON 3 –

**TOPIC – LENGTH **

**LEARNING AREA**

1. Introduction

2. Non Standard Measurements – Arms and Foot Length

3. Standard Measurements – Metres and Centimeters

4. Conversion of Metres and Centimetres

5. Lesson Evaluation and Weekly Assessment (Test)

**PERFORMANCE OBJECTIVES **

By the end of the lesson, most pupils should have attained the following objectives –

1. compare their non standard measures, e.g. arms length.

2. identify the differences in the non standard measures.

3. use meters and centimeters as standard measuring units.

4. identify the need for lengths and measurement using standardized units.

**RATIONALE**

Length is a measure of distance between points. It used to describe how wide or height an object is. There are many standard measuring tools used for measuring length or distance between points. For example, rulers, tape rules, etc.

Before the invention of these standard tools, other things such as arms, length, foot or others are used for measurements and these are called non standard measurement tools.

The concept of measurement of lengths using standard and non measuring tools will enable the pupils to appreciate and improvise means of measuring whenever standard tools are not available.

**ENTRY BEHAVIOUR **

The pupils can measure with measuring tools or improvise using arm or length to measure.

**INSTRUCTIONAL MATERIALS**

The teacher will teach the lesson with the aid of:

1. The classroom

2. Arms length

3. Foot, other non standard measures

4. Metre rule

5. 30cm ruler

6. Biro

7. Pencil.

**METHOD OF TEACHING **

Choose a suitable and appropriate methods for the lessons.

Note – Irrespective of choosing methods of teaching, always introduce an activities that will arouse pupil’s interest or lead them to the lessons.

**REFERENCE MATERIALS**

1. Scheme of Work

2. 9 – Years Basic Education Curriculum

3. Course Book

4. All Relevant Material

5. Online Information

**CONTENT OF THE LESSON **** **

**LESSON 1 – COUNTING NUMBERS **

ACTIVITY 1 – COUNT 841 – 860841 842 843 844 845 846 847 848 849 850

851 852 853 854 855 856 857 858 859 860

ACTIVITY 2 – SKIP COUNT IN 3s841 844 847 850 853 856 859 861

ACTIVITY 3 – SKIP COUNT IN 5s841 855 850 855 860

ACTIVITY 4 – SKIP COUNT IN 6s841 867 854 860

ACTIVITY 5 – SKIP COUNT IN 7s841 848 855 862

ACTIVITY 6 SKIP COUNT 9s841 850 859 868

ACTIVITY 7 – SKIP COUNT 10s841 851 861, etc.

ACTIVITY 8 – CLASS EXERCISE1. Count in 3s starting from 830 – 860.

2. Count in 5s starting from 830 – 860.

3. Count in 6s starting from 830 – 860

4. Count in 9s start from 800 – 860.

5. Count in 10s starting from 800 – 900.

**LESSON 2 – NON STANDARD AND STANDARD MEASUREMENT **

ACTIVITY 1 – ARMS AND FOOT MEASUREMENTTeacher organizes pupils in groups or pairs depending on the size of the class to,

1. measure the lengths of the classroom with their foot and arms length.

- Foot measurement –

- Arms measurement –
2. compare their results with one another by finding the difference.

ACTIVITY 2 – STANDARD MEASUREMENTTeacher guides pupils to measure and record the lengths of classroom using standard tools such as measuring tape.

ACTIVITY 3 – CONCEPT OF LENGTH

Length is the measurement of distance from one point to other side of an object.

Length is measured in centimetres and metres.

- Centimeter (cm) is a metric unit of length that equals one hundredth of a meter. That’s, 100 cm = 1 m

- Meter (m) is a metric unit of length that equals one hundred of a centimeter. That’s, 1 m = 100 cm.

**LESSON 3 – CONVERTING CM TO M (100 CM = 1 M) **

Working Example 1Convert 100 cm to meters.

1st, divide the number of centimeters by 100,

100 ÷ 100 = 1

2nd, change the unit to meter.

100 cm = 1 m

Working Example 2Convert 150 cm to metre.

1st, divide the number of centimeters by 100,

150 ÷ 100 = 2.53

2nd, change the unit to meter.

150 cm = 1.5 m or

1 m 5 cm

Working Example 3Convert 23 cm to metre.

1st, divide the number of centimeters by 100,

23 ÷ 100 = 0.23

2nd, change the unit to metre,

23 cm = 0.23 m

Working Example 4Convert 9 cm to metre.

1st, divide the number of centimeters by 100,

9 ÷ 100 = 0.09

2nd, change the unit to metre,

9 cm = 0.09 m

WORKING EXERCISEConvert the following to metres,

1. 25 cm

2. 125 cm

3. 328 cm

SOLUTIONS1.

25 cm= 25 ÷ 100 =0.25 m

2.

125 cm= 125 ÷ 100 =1.25 mor1 m 25 cm3.

328 cm= 328÷ 100 =3.28 mor3 m or 28 cm

**LESSON 4 – CONVERTING M TO CM (1 M = 100 CM) **

Working Example 1Convert 5 m to centimetres.

1st, multiply the number by 100,

5 x 100

2nd, change the unit to centimetres,

5 m = 500 m

Working Example 2Convert 2.3 m to centimetres.

1st, multiply the number by 100,

2.3 x 100 = 230

2nd, change the unit to centimetres,

2.3 m = 230 cm

Working Example 3Convert 0.8 m to centimetres.

1st, multiply the number by 100,

0.8 x 100 = 80

2nd, change the unit to centimetres,

0.8 m = 80 cm

WORKING EXERCISESConvert the following to centimetres,

1. 11 m

2. 7.9 m

3. 0.61 m

SOLUTIONS1.

11 m= 11 x 100 =1100 cm2.

7.9 m= 7.9 x 100 =790 cm3.

0.61 m= 0.61 x 100 =61 cm

**LESSON 5 – ****REVISION AND WEEKLY ASSESSMENT **

As stated in performance objectives or lesson evaluation.

**PRESENTATION**

To deliver the lesson, the teacher adopts the following steps:

1. To introduce the lesson, the teacher revises the previous lesson. Based on this, he/she asks the pupils some questions;

2. Teacher organizes pupils in groups or pairs depending on the size of the class.

3. Teacher guides pupils to measure the length of the classroom with their foot and arms length and record their results.

Pupil’s Activities – Measure the length of the classroom with their foot and arms length and compare their results with one another.

3. Teacher guides pupils to use metre rule to measure same lengths of the classroom.

Pupil’s Activities – Use metre rule to measure the same length of the classroom.

4. Teacher asks pupils to compare and state the reason between arms and foot with the metre rule.

5. Teacher uses the pupil’s activities and responses to introduce the lesson.

Pupil’s Activities – Pay attention to the lesson introduction.

6. Teacher relates the arms and foot measurement as non standard measurement while the metre rule as standard measurement.

7. Teacher leads a discuss on the meaning and different between standard and non standard measurement.

Pupil’s Activities – Identify the different between standard and non standard measurement.

8. Teacher emphasizes the importance of standard unit as opposed to natural units of measurement.

Pupil’s Activities – Analyze the importance of standard unit as opposed to natural units of measurement.

9. Teacher leads pupils to identify the need for standardized unit of measure within the society.

Pupil’s Activities – Identify the need for standardized unit in measurement.

10. Teacher guides pupils to convert cm to m and m to cm.

Pupil’s Activities – Convert cm to m and m to cm.

11. Summarizes the lessons on the board on the board with appropriate lesson evaluation.

Pupil’s Activities – Participate actively in the summary of the lesson by responding correctly as the questions and write as instructed.

**CONCLUSION**

To conclude the lesson for the week, the teacher revises the entire lesson and links it to the following week’s lesson.

### NEXT LESSON

**LESSON EVALUATION **

Teacher asks pupils to,

1. measure the length and width of their classroom with their foot and arms length.

2. measure the length and width of their classroom using standard measuring units.

3. explain the value of standardized unit of measure.

### WORKBOOK

### WEEKLY ASSESSMENT (TEST)

1. The used I L of arms and foot to measure is known as ________.

2. Which of these are greater?

A. Metre is less than Centimetres

B. Centimetres is greater than Metre

C. Metre is greater than Centimetres

3. 5 centimetres is _____ m.

A. 5

B. 50

C. 500

4. 13 metres is _____ cm.

A. 13

B. 1 300

C. 1 30

5. Measure the lengths of your mathematics exercise book.

Record as _____ cm.