84 : 6 = (60 + 24) : 6 = 60 : 6 + 24 : 6 = 10 + 4 = 14
 
57 : 3 = (30 + 27) : 3 = 30 : 3 + 27 : 3 = 10 + 9 = 19
 
91 : 7 = (70 + 21) : 7 = 70 : 7 + 21 : 7 = 10 + 3 = 13
 
3 * 18 = 3 * (10 + 8) = 3 * 10 + 3 * 8 = 30 + 24 = 54
 
4 * 17 = 4 * (10 + 7) = 4 * 10 + 4 * 7 = 40 + 28 = 68
 
6 * 13 = 6 * (10 + 3) = 6 * 10 + 6 * 3 = 60 + 18 = 78
 
86 : 2 = (80 + 6) : 2 = 80 : 2 + 6 : 2 = 40 + 3 = 43
 
60 : 4 = (40 + 20) : 4 = 40 : 4 + 20 : 4 = 10 + 5 = 15
 
93 : 3 = (90 + 3) : 3 = 90 : 3 + 3 : 3 = 30 + 1 = 31
 
68 : 2 = (60 + 8) : 2 = 60 : 2 + 8 : 2 = 30 + 4 = 34
 
96 : 3 = (90 + 6) : 3 = 90 : 3 + 6 : 3 = 30 + 2 = 32
 
88 : 4 = (80 + 8) : 4 = 80 : 4 + 8 : 4 = 20 + 2 = 22