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Multiply by.

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Presentation on theme: "Multiply by."— Presentation transcript:

1 Multiply by

2 Quick Response 2× × ×3 7× × ×9 =12 =40 =12 =14 =10 =36

3 Jumped to ( ),it means ( )( )
How many grids does Mr. Frog jump each time? 8 1 eight It jumped( )time. 1 Jumped to ( ),it means ( )( ) 8 eight 1

4 Mr. Frog jumps 8 grids each time. Jumped to( ),it means( )( ).
16 24 1 eight 2 eights 3 eights Mr. Frog jumps 8 grids each time. It jumped( )times. 3 2 Jumped to(  ),it means( )( ). 24 16 8s 3 8s 2

5 Mr. Frog jumps 8 grids each time. Jumped to( ),it means( )( ).
16 24 32 40 4 eights 1 eight 2 eights 3 eights 5 eights Mr. Frog jumps 8 grids each time. 4 5 It jumped( )times. Jumped to(  ),it means( )( ). 40 32 8s 4 8s 5

6 Mr. frog jumps 8 grids each time. Jumped to( ),it means( )( ).
16 24 32 40 48 6 8s 56 7 8s 64 8 8s 72 9 8s 80 10 8s One 8 2 8s 3 8s 4 8s 5 8s Jumped to(  ),it means( )( ).

7 Try to give the number sentences.
8 16 24 32 40 48 56 64 72 80 Zero8 One 8 2 8s 3 8s 4 8s 5 8s 6 8s 7 8s 8 8s 9 8s 10 8s 1×8=8 4×8=32 7×8=56 2×8=16 5×8=40 8×8=64 3×8=24 6×8=48 9×8=72

8 1×8= 8 2×8=16 3×8=24 4×8=32 5×8=40 6×8=48 7×8=56 8×8=64 9×8=72 1 2 3 4 5 6 7 8 9 8 8 +8 16 +8 24 +8 32 +8 40 +8 48 +8 56 64 +8 +8 72

9 1×8= 8 2×8=16 3×8=24 4×8=32 5×8=40 6×8=48 7×8=56 8×8=64 9×8=72 One 8 is 8 Two 8s is 16 Three 8s is 24 Four 8s is 32 Five 8s is 40 Six 8s is 48 Seven 8s is 56 Eight 8s is 64 Nine 8s is 72

10 Think about the number sentences. And get the answer.
8×3=24

11 6×8=48

12 7×8=56

13 8×8=64

14 There are 5 rows of benches,8 people in one row,how many people altogether?
5 × 8 = 40

15 8 × 2 = 16 There are 8 bunches of cherries, 2 for each bunch,
how many cherries altogether? 8 × 2 = 16

16 Calculate 8× 8=( ) ( ) ×8=16 5× 8=( ) 64 2 40 1×8=( ) 4×8=( ) 8 32 9
8× 8=( ) ( ) ×8=16 5× 8=( ) 64 2 40 ( ) ×8=72 1×8=( ) 4×8=( ) 8 32 9 7×8=( ) 3 ×( ) =24 ( ) =8×6 56 8 48

17 Write a number sentence and get the answer.
2×8=16 4×4=16

18 Send the little stars home
6×4 3×4 6×4 4×4 3×8 24 16 8×8 8×2 2×8 1×16

19 Send the little stars home
6×4 3×4 6×4 4×4 3×8 24 16 8×8 8×2 2×8 1×16

20 Tell me about your achievements today.

21 5×8= 8×5= 3×8+2×8= 40 40 40 =40

22 3×8+2×8=40 3 8s plus 2 8s is 5 8s. 3 8s 2 8s

23 56 7×8= 8×7= 3×8+4×8= 56 56 =56

24 3×8+4×8=56 3 8s plus 4 8s is 7 8s。 3 8s 4 8s


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