No problem, we've got 8320 and 9645 to multiply
8320 × 9645 = 9645 × (8320)
+ 9645 × 0 what gives us 0
+ 9645 × 20 that equals 192900
+ 9645 × 300 giving us 2893500
+ 9645 × 8000 which equals 77160000

= 80246400
