80 * 10 = 800;
80 : 10 = 8.
 
60 * 10 = 600;
60 : 10 = 6.
 
120 * 4 = (100 + 20) * 4 = 100 * 4 + 20 * 4 = 400 + 80 = 480;
120 : 4 = 30.
 
210 * 3 = (200 + 10) * 3 = 200 * 3 + 10 * 3 = 600 + 30 = 630;
210 : 3 = 70.
 
160 * 4 = (100 + 60) * 4 = 100 * 4 + 60 * 4 = 400 + 200 = 640;
160 : 4 = 40.
 
270 * 3 = (200 + 70) * 3 = 200 * 3 + 70 * 3 = 600 + 210 = 810;
270 : 3 = 9.
 
160 * 2 = (100 + 60) * 2 = 100 * 2 + 60 * 2 = 200 + 120 = 320;
160 : 2 = 80.
 
0 * 7 = 0;
0 : 7 = 0.