Alright, let's work through 1678 times 7225 step by step
1678 × 7225 = 7225 × (1678)
+ 7225 × 8 that results in 57800
+ 7225 × 70 giving us 505750
+ 7225 × 600 producing 4335000
+ 7225 × 1000 that results in 7225000

= 12123550
