Alright, let's work through 1140 times 8421 step by step
1140 × 8421 = 8421 × (1140)
+ 8421 × 0 yielding 0
+ 8421 × 40 which equals 336840
+ 8421 × 100 that is equal 842100
+ 8421 × 1000 giving us 8421000

= 9599940
