Third Term Lesson Note for Week Six
Class: Primary 3
Subject: Mathematics
Topic: Capacity.
Duration : 80 minutes
Period : Double Periods
Reference Book :
- NEW Method Mathematics for Primary Schools, Book 3, by Learn Africa.
- Lagos State Unified Schemes of Work for Primary Schools (Primary 1 – 3).
- Online Resources
Instructional Material : Chart showing metric unit of capacity.
Learning Objectives : By the end of the lesson learners will be able to :
i. Define Capacity and state the unit of capacity.
ii. Identify the materials used in measuring capacity.
iii. Carry out simple arithmetic on capacity .
Previous Knowledge : Learners are familiar with measures of weight.
Content:
The amount of liquid a container holds is called its CAPACITY.
Liquids are things like water, milk, kerosene, oil, petrol, juice, water, etc.
The standard measure for liquid is the litre(l) and millilitre (ml).
Note :
10 millilitre(ml) = 1 centiltre (cl).
10centilitre (cl) = 1 decilitre (dl)
10 decilitre (dl) = 1 litre(l)
1000 litres= (L) = 1 kilolitre (kl)
Note that:
Millilitre = ml
Centilitre = cl
Decilitre = dl
Litre = L
Kilolitre = kl
Examples:
A. Change to litres and millilitres.
(i) 1200ml = 1000ml + 200ml
Since 1000ml is the same as 1L
Therefore; 1L+ 200ml = 1L 200ml
(ii) 1800ml = 1000ml +800ml
We know that 1000 is equal to 1L
Therefore; 1L + 800ml = 1L 800ml
Class activity 1:
Change to litres and millilitres———
(1) 1500ml
(2) 750ml
(3) 4400ml
(4) 3200ml
(5) 4750ml
Examples:
B. Change to millilitres only
(i) 1L 250ml = 1L+250ml
Since 1L is the same as 1000ml
Therefore; 1000ml + 250ml = 1250ml.
(ii) 3L 150ml = 3L + 150ml
3L = 3 × 1000 = 3000ml
Therefore; 3000ml + 150ml= 3150ml.
Class activity 2:
(6) 8L 330ml
(7) 7L 200ml
(8) 5L 950ml
(9) 2L 400ml
(10) 3L 100ml.