Q1 MATH 4 WEEK 3 DAY 2-multiplication of numbers

1. Review:

2. What are 3
groups of 12?
12
x 3
3 6

3. What are 4
times 22?
22
x 4
8 8

4. What is the product
of 32 and 3?
32
x 3
9 6

5. Multiplication
Multiplies numbers up to three digits
by numbers up to two digits with
regrouping.

6. Use
Lattice
Method
Example #1:
Multiply
136 and 25

7. LATTICE
METHOD

8. LATTICE
METHOD

9. LATTICE
METHOD
136
x 25
1 3 6
2
5
1
2
0
6
0
2
3
0
1
5
0
5
0
0
1
4
1
3
3 4 0 0

10. Use
Short
Method
Example #1:
Multiply
136 and 25

11. Th O
T
H
SHORT
METHOD
1 3 6
x 2 5
0
3
3 x 5=15
15 + 3 = 18
8
1 1 x 5=5
5+1=6
6
2
1
2 x 3=6
6+1=7
7
2
+
0
1
0
4
1
3

12. Use
Lattice
Method
Example #2:
Multiply
468 and 37

13. LATTICE
METHOD

14. LATTICE
METHOD

15. LATTICE
METHOD
468
x 37
4 6 8
3
7
2
4
1
8
1
2
5
6
4
2
2
8
6
1
1
3
2
7
17 316
1

16. Use
Short
Method
Example #2:
Multiply
468 and 37

17. SHORT
METHOD
Th O
T
H
4 6 8
x 3 7
6
5
3
4
2 7
4
4
0
2
4
1
+
6
1
1
3
7
1

19. LATTICE
METHOD
146
x 34
1 4 6
3
4
1
8
1
2
0
3
2
4
1
6
0
4
4
6
1
9
4
4 964
0

20. SHORT
METHOD
Th O
T
H
1 4 6
x 3 4
4
2
1
5 8
8
1
3
1
4
+
4
6
1
9
4

21. Estimating
Product
Estimates the products of 3-digit
numbers by 2- to 3- digit
numbers with reasonable results.

22. Review:

23. What is the
value of 6 in
56 817?
6 x 1000 = 6000

24. What is the
value of 8 in
8 245?
8x1000 = 8000

25. What is the
value of 3 in
31 487?
3x10 000 = 30 000

26. Estimate
the
product.
Example #1:
485 x 12

27. STEP 1: Round the multiplicand and
multiplier to the highest place value
ROUND
DOWN: 0, 1, 2,
3, 4
ROUND UP: 5,
6, 7, 8, 9
4 8 5
x 1 2
500
10
x00
0
5

28. Estimate
the
product.
Example #2:
723 x 29

29. STEP 1: Round the multiplicand and
multiplier to the highest place value
ROUND
DOWN: 0, 1, 2,
3, 4
ROUND UP: 5,
6, 7, 8, 9
7 2 3
x 2 9
700
30
x00
0
21

30. Estimate
the
product.
1.) 471 x 32
PRACTICE EXERCISES #1:

31. ROUND
DOWN: 0, 1, 2,
3, 4
ROUND UP: 5,
6, 7, 8, 9
4 7 1
x 3 2
500
30
x00
0
15

32. Estimate
the
product.
2.) 634 x 47
PRACTICE EXERCISES #1:

33. ROUND
DOWN: 0, 1, 2,
3, 4
ROUND UP: 5,
6, 7, 8, 9
6 3 4
x 4 7
600
50
x00
0
30

34. Estimate
the
product.
2.) 762 x 53
PRACTICE EXERCISES #1:

35. ROUND
DOWN: 0, 1, 2,
3, 4
ROUND UP: 5,
6, 7, 8, 9
7 6 2
x 5 3
800
50
x00
0
40