1. Exchange

2. Review: ( ) ( ) 4 3s Addition: Multiplication: 3+3+3+3 =12 4×3 =12
How many groups?
How many in each group?
( ) ( )
Addition:
Multiplication: 4 3s
=12
4×3
=12

3. Review: 7+7+7+7+7=35 5×7=35 9+9=18 4×2 2×9=18 3×6 2+2+2+2=8 6+6+6=18
Multiplication
Addition
5×7=35
2×9=18 =8
6+6+6=18

4. In rows: 3 4s
3×4
In columns 4 3s
4×3
4×3=
3×4

5. Practice 1: ( )×( )=( )×( ) 5 5 4 4 ( )×( )=( )×( ) 3 8 8 3
Can you find the 2 multiplication number sentences according to the picture? (column or row)
( )×( )=( )×( ) 5 5 4 4
( )×( )=( )×( ) 3 8 8 3

6. Practice 2: 2×6 =（ ）×（ ） 6 2 4×8 =（ ）×（ ） 8 4 8 9 （ ）×（ ）= 9×8
Try to find the partner of the number sentence.
2×6 =（ ）×（ ） 6 2
4×8 =（ ）×（ ） 8 4 8 9
（ ）×（ ）= 9×8
△×☆ =（ ）×（ ） ☆ △ 3
7×（ ）= 3 ×（ ） 7

7. Why do we“exchange”(swap) ?
=30
10×3
= 3×10
=30

8. Practice 3:
=( )×( )
=( )×( )=( )+( )= ( )
=( )×( )
= ( )×( )=( )+( ) +( )= ( )
=( )×( )
= ( )×( )=( )+( ) +( ) +( )= ( ) 9 2 2 9 9 9 18 7 3 3 7 7 7 7 21 10 4 4 10 40 10 10 10 10

9. What have we learnt today?
( )×( )=( )×( ) 4 5 5 4
=30
10×3
= 3×10
=30