No problem, we've got 3579 and 8400 to multiply
3579 × 8400 = 8400 × (3579)
+ 8400 × 9 yielding 75600
+ 8400 × 70 that is equal 588000
+ 8400 × 500 what gives us 4200000
+ 8400 × 3000 giving us 25200000

= 30063600
