1. Addition of repeated numbers From addition to multiplication Times
(EX:count 5 4 times)
Exchange
Multiplication of 4
Multiplication of 2
Multiplication of 5
Multiplication of 10
Multiplication and division of
7,3,6,9…
Multiplication of 8
Division

2. Addition of repeated numbers

3. Addition of repeated numbers= 24 8 12 16 20

4. Addition of repeated numbers From addition to multiplication

5. From addition to multiplication
( )+( )+( )+( )+( )+（ ）=( ) 3 3 3 3 3 3 18 3s
（ ）（ ）equals ( ) 6 18
（ ）×（ ）=( ) 6 3 18

6. 3 3 3 3 3 3 18 3 18 6 ( )+( )+( )+( )+( )+（ ）=( ) （ ）×（ ）=( ) factor
( )+( )+( )+( )+( )+（ ）=( ) 3 3 3 3 3 3 18 3 18
（ ）×（ ）=( ) 6
factor
factor
product
Sign of multiplication

7. How many apples? Can you use multiplication?=8 =8
4 X 2=8

8. Addition of repeated numbers From addition to multiplication
Exchange

9. 3 4s
3×4
4 3s
4×3
4×3=
3×4

10. 7×3
=3×7
=7+7+7
=21

11. Addition of repeated numbers From addition to multiplication
Times
(EX:count 5 4 times)
Exchange

12. 上海是伦敦的3倍大 ‘s
Shanghai is
London
3 times
bigger
Shanghai=London ×3
3 Londons
3×London
Shanghai is 3 times bigger than London
Shanghai =3 ×London
3 Londons
3 ×London

13. I can’t find 3 6s from this picture.
How many people in all?
I can’t find 3 6s from this picture.
2 steps
6×3
3×6
exchange
6 3s
Count 3 6 times
1 step

14. There are 5 cars, and each car has 4 wheels
There are 5 cars, and each car has 4 wheels. How many wheels are there in all?
5× ×5

15. Addition of repeated numbers From addition to multiplication
Times
(EX:count 5 4 times)
Exchange
Multiplication of 10

16. Can you find any secrets from these number sentences?
1×10=10
2×10=20
3×10=30
4×10=40
5×10=50
6×10=60
7×10=70
8×10=80
9×10=90
1×10=10
2×10=20
3×10=30
4×10=40
5×10=50
6×10=60
7×10=70
8×10=80
9×10=90
A number times 10, we can move the digit one place to find the answer.
8×10= 8

17. ( ) 10s count 10 ( ) times 1×10= 10 10× 1 = 10 2×10= 20 10× 2 = 20
3×10= 30
4×10= 40
5×10= 50
6×10= 60
7×10= 70
8×10= 80
9×10= 90
10×10=100
10× 1 = 10
10× 2 = 20
10× 3 = 30
10× 4 = 40
10× 5 = 50
10× 6 = 60
10× 7 = 70
10× 8 = 80
10× 9 = 90
10×10=100

18. I need help!
3+4×10
Multiplication first

19. Addition of repeated numbers From addition to multiplication
Times
(EX:count 5 4 times)
Exchange
Multiplication of 5
Multiplication of 10

20. 5 in one jump 5 10 15 20 25 30 35 40 45 50

21. 1×5=5 2×5=10 3×5=15 4×5= 5×5= 6×5= 7×5= 8×5= 9×5= 5×1=5 5×2=10 5×3=15
( ) 5s
Formula
Count 5()times
1×5=5
2×5=10
3×5=15
4×5=
5×5=
6×5=
7×5=
8×5=
9×5= 20 25 30 35 40 45
1 5 is 5
5×1=5
5×2=10
2 5s are 10
5×3=15
3 5s 15
5×4=20
4 5s are 20
5 5s 25
5×5=25
6 5s are 30
5×6=30
5×7=35
7 5s 35
5×8=40
8 5s are 40
5×9=45
9 5s 45

22. 1×5=5 2×5=10 3×5=15 4×5= 5×5= 6×5= 7×5= 8×5= 9×5= 1×5=5 2×5=10 3×5=1520 25 30 35 40 45
1×5=5
2×5=10
3×5=15
4×5=□
5×5=□
6×5=□
7×5=□
8×5=□
9×5=□ 20 25 30 35 40 45
1×5=5
3×5=15
5×5=25
7×5=35
9×5=45
2×5=10
4×5=20
6×5=30
8×5=40

23. There are 5 balloons in each one’s hand and there are 9 people
There are 5 balloons in each one’s hand and there are 9 people. How many balloons are there in all?
9×5=45
Multiplication:
9 5s 45

24. There are 6 plates and 5 strawberries in each plate
There are 6 plates and 5 strawberries in each plate. How many strawberries in all?
6×5=30
Multiplication:
6 5s are 30

25. There are 5 red cubes. The green cubes are 2 times more than the red ones. How many green ones?
5×2=10
Multiplication:
2 5s are 10

26. Dong nao jin
13×5= 65
10×5
3×5 50 ＋ 15

27. Addition of repeated numbers From addition to multiplication
Times
(EX:count 5 4 times)
Exchange
Multiplication of 2
Multiplication of 5
Multiplication of 10

28. 1×2=2 2×2=4 3×2=6 4×2= 5×2= 6×2= 7×2= 8×2= 9×2= 2×1=2 2×2=4 2×3=6
( ) 2s
Formula
Count 2( )times
1×2=2
2×2=4
3×2=6
4×2=
5×2=
6×2=
7×2=
8×2=
9×2= 8 10 12 14 16 18
1 2 2
2×1=2
2×2=4
2 2s 4
2×3=6
3 2s 6
2×4=8
4 2s 8
2×5=10
5 2s 10
2×6=12
6 2s 12
2×7=14
7 2s 14
2×8=16
8 2s 16
2×9=18
9 2s 18

29. Derive
Use what we’ve learnt
1×2＝ ＋?
2×2＝?
WHY?
5×2＝
10×2＝

30. You can use the formula to help
Can you find the answer?
You can use the formula to help
5×2= 10
2×5= 10
6×2= 12
2×6= 12
8×2= 16
2×9= 18
( )×2=8 4
7×( )=14 2
5×2+6=( ) 16
4+6×2=( ) 16 10 12

31. Can you solve the problem?
There are 2 cherries in one group. How many cherries are there in all?
8×2=16
Multiplication:
8 2s 16

32. 7×2=14 7 2s 14 2 pounds for each Jimmy wants to buy 7 .
How much should he pay ?
7×2=14
Multiplication:
7 2s 14

33. How many pairs…? 6 socks =( )pairs 3 6 =( ) ×2 3 14 gloves =( )pairs 7
6 =( ) ×2 3
14 gloves =( )pairs 7
14 =( ) ×2 7
6 boxing gloves =( )pairs 3
6 =( ) ×2 3

34. Challenge

35. The player’s number is…9 16 4 10
Smaller than: 7 ×2
Bigger than: 3 ×2 9
Not equal to: 2 ×5

36. The player’s number is…8 20 35 23
Smaller than: 5×6
Bigger than: 8 ×2 23
Not equal to: 4 ×5

37. The player’s number is…21 26 20 27
It is an even number. 20
Bigger than: 9×2
Smaller than: 5×5

38. The player’s number is…21 15 20 11
It is an odd number.
Smaller than: 10 ×2 15
Bigger than: 2×6

39. Addition of repeated numbers From addition to multiplication Times
(EX:count 5 4 times)
Exchange
Multiplication of 4
Multiplication of 2
Multiplication of 5
Multiplication of 10
Multiplication and division of
7,3,6,9…
Multiplication of 8
Division