No problem, we've got 2825 and 3900 to multiply
2825 × 3900 = 3900 × (2825)
+ 3900 × 5 what gives us 19500
+ 3900 × 20 yielding 78000
+ 3900 × 800 yielding 3120000
+ 3900 × 2000 yielding 7800000

= 11017500
