We're going to solve 1642 multiplied by 1645
1642 × 1645 = 1645 × (1642)
+ 1645 × 2 that is equal 3290
+ 1645 × 40 resulting in 65800
+ 1645 × 600 producing 987000
+ 1645 × 1000 yielding 1645000

= 2701090
