Alright, let's work through 1680 times 1402 step by step
1680 × 1402 = 1402 × (1680)
+ 1402 × 0 that results in 0
+ 1402 × 80 that is equal 112160
+ 1402 × 600 which equals 841200
+ 1402 × 1000 producing 1402000

= 2355360
