Respuesta :
28 - 7 = 21
21 - 7 = 14
14 - 7 = 7
7 - 7 = 0
Therefore 28 - 7 - 7 - 7 - 7 = 0
There are 4 groups of 7, so 28 ÷ 7 = 4
21 - 7 = 14
14 - 7 = 7
7 - 7 = 0
Therefore 28 - 7 - 7 - 7 - 7 = 0
There are 4 groups of 7, so 28 ÷ 7 = 4