Alright, let's work through 1680 times 5554 step by step
1680 × 5554 = 5554 × (1680)
+ 5554 × 0 that equals 0
+ 5554 × 80 that results in 444320
+ 5554 × 600 which equals 3332400
+ 5554 × 1000 resulting in 5554000

= 9330720
