No problem, we've got 4384 and 1660 to multiply
4384 × 1660 = 1660 × (4384)
+ 1660 × 4 what gives us 6640
+ 1660 × 80 resulting in 132800
+ 1660 × 300 that equals 498000
+ 1660 × 4000 producing 6640000

= 7277440
