Alright, let's work through 4240 times 1601 step by step
4240 × 1601 = 1601 × (4240)
+ 1601 × 0 that equals 0
+ 1601 × 40 which equals 64040
+ 1601 × 200 giving us 320200
+ 1601 × 4000 yielding 6404000

= 6788240
