Second Term Lesson Note for Week One
Class : Primary Four
Subject : Mathematics
Topic : Revision /Multiplication of numbers.
Duration : 80 Minutes
Period : Double Periods
Reference Book :
New Method Mathematics for Primary Schools, Book 4, by Learn Africa.
Lagos State Unified schemes of work for Upper Primary, (Primary 4 – 6).
Online Resources
Instructional Material : Chart showing the multiplication tables of numbers from 2 times to 12 times.
Learning Objectives : By the end of the lesson learners will be able to :
MULTIPLICATION OF NUMBERS BY 2-DIGIT NUMBERS
Example 1 : Multiply 25 by 12
Method 1: column form
method 2: Expanded form
2 5 25 x 12 = 25 x (10 = 2)
x 1 2 = (25 x 10) = (25 x 2)
2 5 0 (25 x 10) = 250 + 50
+ 5 0 (25 x 2) = 300
3 0 0
5 4 Step 1: Multiply the units
× 2 6 Regroup.
3 2 4 = 54 × 6
Step 2: Multiply the tens
+ 1 0 8 0 = 54 × 20 Regroup
1 4 0 4 = 54 × 26
EXERCIES 1:
Multiply the following
1. 53 x 50 11. 84 x 10
2. 97 x 10 12. 96 x 40
3. 67 x 50 13. 67 x 50
4. 87 x 20 14. 64 x 30
57 x 40 15. 64 x 40
56 x 10 16. 95 x 20
15. 86 x 20 17. 84 x 50
16. 99 x 50 18. 75 x 10
17. 89 x 30 20. 75 x 40
EXERCISE 2: multiply the following
89 x 46
45 x 37
56 x 17
88 x 32
36 x 35
78 x 18
76 x 26
29 x 27
79 x 49
75 x 46
Example
25 × 34 = (20 × 34) + (5 × 34)
= 680 + 170
= 850
Exercise 3
Copy and fill the boxes with the correct numerals.
1. 24 × 33 = ( 20 × 33) + ( × 33) = 2. 35 × 48 = ( × 48) + ( × 48) =
3. 47 × 18 = ( × 18) + ( × 18) = 4. 45 × 35 = (40 × 35) + (5 × 35) =
5. 41 × 25 = (40 × 25) + ( × 25) = 6. 29 × 49 = ( × 49) + ( × 49) =
7. 57 × 16 = ( × 16) + ( × 16) = 8. 61 × 25 = ( × 25) + ( × 25) =
9. (12 × 7) + (30 × 7) = 10. 7 × 82 = (7 × ) + (7 × 2)
11. (20 × 8) + (2 × 8) = 12. 8 × 82 = (8 × ) + (8 × 2) =
13. 20 × 42 = (20 × 40) + (20 × 2) = 14. 50 × 28 = (50 × 20) + (50 × ) =