Alright, let's work through 1634 times 642 step by step
1634 × 642 = 642 × (1634)
+ 642 × 4 giving us 2568
+ 642 × 30 yielding 19260
+ 642 × 600 that is equal 385200
+ 642 × 1000 that equals 642000

= 1049028
