No problem, we've got 3135 and 2600 to multiply
3135 × 2600 = 2600 × (3135)
+ 2600 × 5 what gives us 13000
+ 2600 × 30 producing 78000
+ 2600 × 100 that is equal 260000
+ 2600 × 3000 what gives us 7800000

= 8151000
