No problem, we've got 2500 and 2161 to multiply
2500 × 2161 = 2161 × (2500)
+ 2161 × 0 resulting in 0
+ 2161 × 00 resulting in 0
+ 2161 × 500 that is equal 1080500
+ 2161 × 2000 that results in 4322000

= 5402500
