Alright, let's work through 1641 times 650 step by step
1641 × 650 = 650 × (1641)
+ 650 × 1 that is equal 650
+ 650 × 40 that equals 26000
+ 650 × 600 which equals 390000
+ 650 × 1000 resulting in 650000

= 1066650
