No problem, we've got 3657 and 800 to multiply
3657 × 800 = 800 × (3657)
+ 800 × 7 which equals 5600
+ 800 × 50 which equals 40000
+ 800 × 600 what gives us 480000
+ 800 × 3000 giving us 2400000

= 2925600
