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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
- 53 x 50 84 x 10
- 97 x 10 96 x 40
- 67 x 50 67 x 50
- 87 x 20 64 x 30
- 57 x 40 64 x 40
- 56 x 10 95 x 20
- 86 x 20 84 x 50
- 99 x 50 75 x 10
- 89 x 30
- 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.
- 24 × 33 = ( 20 × 33) + ( × 33) = 2. 35 × 48 = ( × 48) + ( × 48) =
- 47 × 18 = ( × 18) + ( × 18) = 4. 45 × 35 = (40 × 35) + (5 × 35) =
- 41 × 25 = (40 × 25) + ( × 25) = 6. 29 × 49 = ( × 49) + ( × 49) =
- 57 × 16 = ( × 16) + ( × 16) = 8. 61 × 25 = ( × 25) + ( × 25) =
- (12 × 7) + (30 × 7) = 10. 7 × 82 = (7 × ) + (7 × 2)
- (20 × 8) + (2 × 8) = 12. 8 × 82 = (8 × ) + (8 × 2) =
- 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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