Alright, let's work through 1667 times 420 step by step
1667 × 420 = 420 × (1667)
+ 420 × 7 yielding 2940
+ 420 × 60 resulting in 25200
+ 420 × 600 that equals 252000
+ 420 × 1000 resulting in 420000

= 700140
