Alright, let's work through 1657 times 7642 step by step
1657 × 7642 = 7642 × (1657)
+ 7642 × 7 giving us 53494
+ 7642 × 50 what gives us 382100
+ 7642 × 600 that results in 4585200
+ 7642 × 1000 what gives us 7642000

= 12662794
