No problem, we've got 1931 and 9661 to multiply
1931 × 9661 = 9661 × (1931)
+ 9661 × 1 giving us 9661
+ 9661 × 30 what gives us 289830
+ 9661 × 900 that is equal 8694900
+ 9661 × 1000 which equals 9661000

= 18655391
