No problem, we've got 1987 and 1645 to multiply
1987 × 1645 = 1645 × (1987)
+ 1645 × 7 that is equal 11515
+ 1645 × 80 that equals 131600
+ 1645 × 900 which equals 1480500
+ 1645 × 1000 that is equal 1645000

= 3268615
