No problem, we've got 1639 and 2670 to multiply
1639 × 2670 = 2670 × (1639)
+ 2670 × 9 that results in 24030
+ 2670 × 30 which equals 80100
+ 2670 × 600 resulting in 1602000
+ 2670 × 1000 that is equal 2670000

= 4376130
