No problem, we've got 2780 and 5780 to multiply
2780 × 5780 = 5780 × (2780)
+ 5780 × 0 that is equal 0
+ 5780 × 80 resulting in 462400
+ 5780 × 700 resulting in 4046000
+ 5780 × 2000 giving us 11560000

= 16068400
