Номер 902

2) 2100 : 30 = 70;
30 : 30 = 1;
180 : 30 = 6;
360 : 30 = 12;
3000 : 30 = 100;
120 : 30 = 4;
90 : 30 = 3;
900 : 30 = 30.

100 · 40 = 4000;
1 · 40 = 40;
0 · 40 = 0;
140 · 40 = 5600;
6000 · 40 = 240 000;
240 · 40 = 9600;
5 · 40 = 200;
40 · 40 = 1600.