657
x 234
------
2628 (657 * 4)
1971 (657 * 30)
1314 (657 * 200)
------
153738
745
x 186
------
4470 (745 * 6)
5960 (745 * 80)
745 (745 * 100)
------
138570
1526
x 318
------
12208 (1526 * 8)
1526 (1526 * 10)
4578 (1526 * 300)
------
485268
2673
x 425
------
13365 (2673 * 5)
5346 (2673 * 20)
10692 (2673 * 400)
------
1136025
Ответ: 657 · 234 = 153738; 745 · 186 = 138570; 1 526 · 318 = 485268; 2 673 · 425 = 1136025