Alright, let's work through 1686 times 6335 step by step
1686 × 6335 = 6335 × (1686)
+ 6335 × 6 that equals 38010
+ 6335 × 80 yielding 506800
+ 6335 × 600 what gives us 3801000
+ 6335 × 1000 that is equal 6335000

= 10680810
