No problem, we've got 8169 and 8509 to multiply
8169 × 8509 = 8509 × (8169)
+ 8509 × 9 that equals 76581
+ 8509 × 60 that is equal 510540
+ 8509 × 100 what gives us 850900
+ 8509 × 8000 resulting in 68072000

= 69510021
