Alright, let's work through 9857 times 1378 step by step
9857 × 1378 = 1378 × (9857)
+ 1378 × 7 giving us 9646
+ 1378 × 50 which equals 68900
+ 1378 × 800 giving us 1102400
+ 1378 × 9000 yielding 12402000

= 13582946
