40/45 = 8x5/ 9x5 = (tu barre les 5) =8/9

5/35 = 1x5 / 7x5 = 1/7

= 1x2/2x4 = 1/4

2/20 = 2x1 / 10 x2= 1/10

3/21 = 3x1/3x7= 1/7

20/32= 4x5/4x8 = 5/8

6/14= 2x3/2x7= 3/7

28/40=4x7/4x10= 7/10

2/18= 2x1/2x9= 1/9

24/28= 4x6/4x7= 6/7

4/6 = 2x2/2x3= 2/3

12/27= 3x4/3x9= 4/9

20/32= 4x5/4x8= 5/8

22/24=2x11/2x12= 11/12

4/48= 4x1/4x12= 1/12

4/8= 4x1/4x2= 1/2

2/4=2x1/2x2= 1/2

2/8=2x1/2x4 = 1/4

15/27=3x5/3x9= 5/9

20/36=4x5/4x9= 5/9

40/45=5x8/5x9= 8/9   il te l'a donné 2 fois celui là

25/35 = 5x5/5x7= 5/7

2/20 = 2x1/2x10= 1/10

12/20=3x4/4x5= 3/5

16/28=4x4/4x7= 4/7

15/27= 3x5/3x9= 5/9 donné 2 fois!!

2/4= 2x1/2x2= 1/2 donné 2 fois!!

10/18=2x5/2x9= 5/9

25/30= 5x5/5x6= 5/6

8/28= 4x2/4x7= 2/7

5/10=5x1/5x2= 1/2

28/36= 4x7/4x9= 7/9

3/21= 3x1/3x7= 1/7

15/35=5x3/5x7=3/7

4/28= 4x1/4x7= 1/7