No problem, we've got 9915 and 669 to multiply
9915 × 669 = 669 × (9915)
+ 669 × 5 that is equal 3345
+ 669 × 10 producing 6690
+ 669 × 900 what gives us 602100
+ 669 × 9000 that is equal 6021000

= 6633135
