Alright, let's work through 7731 times 64 step by step
7731 × 64 = 64 × (7731)
+ 64 × 1 giving us 64
+ 64 × 30 what gives us 1920
+ 64 × 700 giving us 44800
+ 64 × 7000 what gives us 448000

= 494784
