Alright, let's work through 1678 times 1305 step by step
1678 × 1305 = 1305 × (1678)
+ 1305 × 8 which equals 10440
+ 1305 × 70 which equals 91350
+ 1305 × 600 producing 783000
+ 1305 × 1000 what gives us 1305000

= 2189790
