Calcula 9+1= 8+1= 7+2= 6+3= 5+4= 4+8= 3+5= 2+4= 1+5= 2+5= 3+6= 4+4= 5+3= 6+2=
Calcula: 90 + 10 = 80 + 10 = 70 + 20 = 60 + 30 = 50 + 40 = 40 + 80 = 30 + 50 = 20 + 40 = 10 + 50 = 20 + 50 = 30 + 60 = 40 + 40 = 50 + 30 = 60 + 20 =
Calcula: 90 + 1 = 80 + 1 = 70 + 2 = 60 + 3 = 50 + 4 = 40 + 8 = 30 + 5 = 20 + 4 = 10 + 5 = 20 + 5 = 30 + 6 = 40 + 4 = 50 + 3 = 60 + 2 =
Descompone 91 = 81 = 72 = 63 = 54 = 48 = 35 = 24 = 15 = 25 = 36 = 44 = 53 = 62 =
83= 80 + 3