63:9=7; 30:5=6; 12:2=6; 4·7=28; 72:8=9; 21:3=7; 8:4=2; 8:2=4; 18:9=2; 32:8=4; 40:5=8; 2·5=10; 12:3=4; 5·6=30; 7·8=56; 42:6=7; 2:1=2; 4·6=24; 20:4=5; 12:4=3.