No problem, we've got 8783 and 3640 to multiply
8783 × 3640 = 3640 × (8783)
+ 3640 × 3 what gives us 10920
+ 3640 × 80 which equals 291200
+ 3640 × 700 which equals 2548000
+ 3640 × 8000 resulting in 29120000

= 31970120
