6 x 6 = 36                 7 x 9  = 63            8 x 7 = 56              9 x 6 = 54

      48 : 6 = 8                  54 : 6 = 9              42 : 6 = 42            63 : 7 = 9

6 x 6 = 36             7 x 9  = 63            8 x 7 = 56              9 x 6 = 54

48 : 6 = 8               54 : 6 = 9              42 : 6 = 42            63 : 7 = 9

6 x 7 = 42

6 x 5 = 30

7 x 8 = 56 

7 x 7 = 49

7 x 9 = 63

6 x 9 = 54

42, 30, 56.

(9 + 6) x 4 = 15 x 4 = 60

9 + 6 x 4 = 9 + 24 = 33

Học sinh nhẩm và ghi:

6 x 6 = 36

6 x 9 = 54

6 x 7 = 42

6 x 8 = 48

36 : 6 = 6

54 : 6 = 9

42 : 6 = 7

48 : 6 = 8

6 x 5 = 30

6 x 10 = 60

6 x 2 = 12

6 x 7 = 42

6 x 8 = 48

6 x 3 = 18

6 x 9 = 54

6 x 6 = 36

6 x 4 = 24

Bài 2:

a: 2/6x5/3=10/18=5/9

b: 11/9x5/10=55/90=11/18

c: 3/9x6/8=1/3x3/4=1/4

d: 4/9x12/16=48/144=1/3

e: 25/15x6/7=5/3x6/7=30/21=10/7

f: 6/10x15/20=90/200=9/20

Bài 1

4/5 x 6/7= 24/35

2/9 x 1/2= 2/18= 1/9

1/2 x 8/3= 8/6= 4/3

7/9 x 6/5= 42/45= 14/15

8/7 x 5/9= 40/63

10/11 x 22/15= 220/165= 4/3

Bài 2

2/6 x 5/3= 1/3 x 5/3=5/9

11/9 x 5/10= 11/9 x 1/2= 11/18

3/9 x 6/8= 1/3 x 3/4 =3/12= 1/4

4/9 x 12/16= 4/9 x 3/4= 12/36= 1/3

25/15 x 6/7= 5/3 x 6/7= 30/21= 10/7

6/10 x 15/20= 3/5 x 3/4= 9/20

bài 1

4/5 x 6/7 = 24/35

2/9 x 1/2 = 1/9

1/2 x 8/3 = 4/3

7/9 x 6/5 = 14/15

8/7 x 5/9 = 14/15

8/7 x 5/9 = 40/63

10/11 x 22/15 = 4/3

a: \(=\dfrac{5}{14}\left(\dfrac{2}{9}+\dfrac{7}{9}+1\right)=\dfrac{5}{14}\cdot2=\dfrac{5}{7}\)

b: \(=\dfrac{6}{8}\left(\dfrac{6}{7}-6\right)=\dfrac{6}{8}\cdot\dfrac{-36}{7}=\dfrac{-216}{56}=\dfrac{-27}{7}\)

7 x 6 = 42                                   49 : 7 = 7

6 x 9 =54                                     42 : 6 = 7

6 x 1 = 6              6 x 9 = 54

6 x 2 = 12              6 x 8 = 48

6 x 3 = 18              6 x 7 = 42

6 x 4 = 24              0 x 6 = 0

6 x 5 = 30              6 x 0 = 0

6 x 6 = 36              6 x 10 = 60