Alright, let's work through 9045 times 6441 step by step
9045 × 6441 = 6441 × (9045)
+ 6441 × 5 what gives us 32205
+ 6441 × 40 which equals 257640
+ 6441 × 000 what gives us 0
+ 6441 × 9000 that results in 57969000

= 58258845
