Length lesson conversion

Lesson 2

SUBJECT: Mathematics

GRADE : 3

Measurement

Length

Topic for today

LEARNING OBJECTIVE

 Define length and identify standard units of

measurement of length.

 Use standard metric units of length(kilometer,

metre, and centimetre) including abbreviation.

 Convert kilometres to metres and vice versa.

Objective: Students will be able to define length, know its units.

Real Life application of Measurement

Here are some real-life links to the concept of length for Grade 3
students:
1.Measuring objects: Comparing the length of a pencil, notebook, or
ruler.
2.Clothing sizes: Using tape measures to find the length of clothes.
3.Sports fields: Estimating or measuring lengths of playgrounds or
tracks.

Link with other subjects

• Engineering: Length is essential in designing structures, roads,

bridges, etc., as it determines the dimensions and scale of the
project.

• Biology: Measure the size of organ like bones heart and

Link with UAE

Objectives: To Identify the place value of numbers up to 5-digits and accurately naming 5 digits numbers in words.

The UAE (United Arab Emirates) has a length of
approximately 500 kilometers from north to south. This
measurement reflects the distance across the country, which
is located in the southeastern corner of the Arabian
Peninsula.

Recap

Length

• Length is a measure of how long something is.
• The most commonly used units of length are metre,

centimeter, millimeter, and kilometer.

• The standard unit of length is metre.

Recap

Objective: Students will be able to define length, know its units.

Kilometre

A kilometer or kilometre (symbol: km) is a
unit of length in the International System
of Units (SI).

Topic: Length

Q5:Write these lengths in km.

a. 3000 m

3000m = 3km

b.2000 m

2000m = 2km

c.6000m

6000m= 6Km

• Now try yourself
• d. 9000 m

• e. 40000 m

• f. 1000m

1km =1000 m

Individual activity

Objective: Students will be able to convert m into km.

Topic: Length

b. 8 km 82 m

8 km= 8000m

8000 m

+ 82 m

8082 m

8 km 82 m = 8082 m

1km =1000 m

Q6:Convert these length into m.

a. 3 km 591 m

3km= 3000m

3000 m

+591 m

3591 m

3km 591m = 3591 m

Objective: Students will be able to convert km into m.

Individual activity

Topic: Length

Now try yourself

d. 6 km 9 m

e.9 km 630 m

1km =1000 m

Q6:Convert these length into m.

c. 1 km 99 m

1km= 1000m

1000 m

+ 99 m

1099 m

Copy work

Objective: Students will be able to convert km into m.

Challenge

"The distance between two cities is 2,345 kilometers. A
train covers this distance three times in a week. What is
the total distance traveled by the train in meters?"

Group Activity

• https://www.liveworksheets.com/node/6248846 (red)
• https://www.liveworksheets.com/w/en/math/621415 (yellow)
• https://www.liveworksheets.com/w/en/math/795010 (Blue)

Topic: Length

Book work
Extended task
Self assessment

Objective: Students will be able to use standard metric units of length and convert them as required.

Topic: Length

Challenge
Group work
Peer assessment

Objective: Students will be able to use standard metric units of length and convert them as required.

Topic: Length

Book work
review

Objective: Students will be able to compare different units of length

Topic: Length

Book work
Home work

Objective: Students will be able to compare different units of length

1. Read the question

1.Circle/colour the numbers

2.Decide which operation you need to use add,
subtract, multiply or divide

3. Write statements.
4. Draw the objects – show your workings

Objective: Students will be able to understand steps in problem solving.

How to solve word problem

Explanation

Real Life Story Sums

• Q1:Sana has two pieces of cloth. One piece is 80 cm long and other is 340 cm long.

What is the total length of both the pieces?

• Solution
• Length of one piece = 80 cm
• Length of other piece= 340 cm
• Total length of both pieces =?

3 4 0 cm
+ 8 0 cm

_________

Total length of both the pieces =420 cm

c.w

Objective: Students will be able to solve real life story sums.

Copy work
Individual work

Real Life Story Sums
• Q2:Mr Hasan is 196 cm tall. His son, Sami, is 76 cm tall. How much

taller is Mr. Hasan than Sami?

• Solution
• Length of Mr Hasan = 196 cm
• Length of Sami = 76 cm
• How much taller is Mr Hasan than Sami =?

1 9 6 cm

-

7 6 cm

_________

Total length of both the pieces =1 2 0 cm

c.w

Objective: Students will be able to solve real life story sums.

Copy work
Individual work

Real Life Story Sums

•Q3:A shopkeeper sold 165 m of blue silk on Monday, 575 m on Tuesday, and 10 m on Wednesday.
How much silk did he sell altogether?

•Solution

•Length of silk sold on Monday = 165 m

•Length of silk sold on Tuesday = 575 m

•Length of silk sold on Wednesday = 10 m

•Silk sold altogether=?

1 6 5 m

5 7 5 m

+ 1 0 m

_________

Silk sold altogether= 750 m

c.w

Objective: Students will be able to solve real life story sums.

Copy work
Individual work

Real Life Story Sums

A lamppost is 12m long . 1 m of the post is below the ground, so
that the post will not be blown over. How much of the lamp-post is
left above the ground?

Objective: Students will be able to solve real life story sums.

Review

Data Based Assessment (10 mins)

Teacher’s feedback

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