Bonsoir,
15/18 = (3 x 5) / (3 x 6) = 5/6
6/9 = (3 x 2) / (3 x 3) = 2/3
12/18 = (6 x 2) / (6 x 3) = 2/3
10/12 = (2 x 5) / (2 x 6) = 5/6
21/28 = (7 x 3) / (7 x 4) = 3/4
6/8 = (2 x 3) / (2 x 4) = 3/4
10/15 = (5 x 2) / (5 x 3) = 2/3
20/24 = (4 x 5) / (4 x 6) = 5/6
Donc :
Fractions égales à 2/3 → 6/9 ; 12/18 ; 10/15.
Fractions égales à 3/4 → 21/28 ; 6/8.
Fractions égales à 5/6 → 15/18 ; 10/12 ; 20/24.
