No problem, we've got 6409 and 2440 to multiply
6409 × 2440 = 2440 × (6409)
+ 2440 × 9 that is equal 21960
+ 2440 × 00 what gives us 0
+ 2440 × 400 that results in 976000
+ 2440 × 6000 resulting in 14640000

= 15637960
