No problem, we've got 8131 and 4915 to multiply
8131 × 4915 = 4915 × (8131)
+ 4915 × 1 that is equal 4915
+ 4915 × 30 yielding 147450
+ 4915 × 100 what gives us 491500
+ 4915 × 8000 which equals 39320000

= 39963865
