No problem, we've got 4200 and 6999 to multiply
4200 × 6999 = 6999 × (4200)
+ 6999 × 0 that is equal 0
+ 6999 × 00 what gives us 0
+ 6999 × 200 what gives us 1399800
+ 6999 × 4000 that is equal 27996000

= 29395800
