Primary Four Second Term Mathematics Lesson Note

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PRIMARY 4 MATHEMATICS SECOND-TERM E NOTES

SUBJECT: MATHEMATICS

CLASS: BASIC FOUR

WEEK ONE

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    84  x  10
2. 97 x  10                                            96  x 40
3. 67 x  50                                            67  x  50
4. 87 x  20                                           64  x  30
5. 57 x  40                                           64  x  40
6. 56 x  10                                           95  x  20
7. 86 x  20                                           84  x  50
8. 99 x  50                                                 75  x  10
9. 89 x  30
10. 75 x 40

EXERCISE 2: multiply the following

1. 89  x 46
2. 45  x  37
3. 56  x  17
4. 88  x  32
5. 36  x  35
6. 78  x  18
7. 76  x  26
8. 29  x  27
9. 79  x  49
10. 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) = 􀁆
2. 47 × 18 = ( × 18) + ( 􀁆× 18) = 􀁆4. 45 × 35 = (40 × 35) + (5 × 35) = 􀁆
3. 41 × 25 = (40 × 25) + ( × 25) = 􀁆6. 29 × 49 = ( × 49) + ( 􀁆× 49) = 􀁆
4. 57 × 16 = ( × 16) + ( 􀁆× 16) = 􀁆8. 61 × 25 = ( × 25) + ( 􀁆× 25) = 􀁆
5. (12 × 7) + (30 × 7) = 􀁆10. 7 × 82 = (7 × 􀁆􀀃) + (7 × 2) 􀁆
6. (20 × 8) + (2 × 8) = 􀁆12. 8 × 82 = (8 × 􀁆􀀃) + (8 × 2) = 􀁆
7. 20 × 42 = (20 × 40) + (20 × 2) = 􀁆14. 50 × 28 = (50 × 20) + (50 × 􀁆􀀃) = 􀁆

WEEK TWO

BEHAVIOURAL OBJECTIVES: At the end of the lesson, pupils should be able to

• discover what squares and square roots mean
• solve problems involving the calculation of squares of numbers.

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