No problem, we've got 3457 and 639 to multiply
3457 × 639 = 639 × (3457)
+ 639 × 7 that equals 4473
+ 639 × 50 what gives us 31950
+ 639 × 400 that results in 255600
+ 639 × 3000 what gives us 1917000

= 2209023
