No problem, we've got 3157 and 1780 to multiply
3157 × 1780 = 1780 × (3157)
+ 1780 × 7 giving us 12460
+ 1780 × 50 giving us 89000
+ 1780 × 100 that is equal 178000
+ 1780 × 3000 what gives us 5340000

= 5619460
