No problem, we've got 8931 and 500 to multiply
8931 × 500 = 500 × (8931)
+ 500 × 1 that is equal 500
+ 500 × 30 that is equal 15000
+ 500 × 900 giving us 450000
+ 500 × 8000 what gives us 4000000

= 4465500
