Alright, let's work through 3545 times 7164 step by step
3545 × 7164 = 7164 × (3545)
+ 7164 × 5 which equals 35820
+ 7164 × 40 giving us 286560
+ 7164 × 500 what gives us 3582000
+ 7164 × 3000 what gives us 21492000

= 25396380
