Alright, let's work through 1685 times 354 step by step
1685 × 354 = 354 × (1685)
+ 354 × 5 what gives us 1770
+ 354 × 80 that is equal 28320
+ 354 × 600 producing 212400
+ 354 × 1000 producing 354000

= 596490
