No problem, we've got 1670 and 3521 to multiply
1670 × 3521 = 3521 × (1670)
+ 3521 × 0 that is equal 0
+ 3521 × 70 that results in 246470
+ 3521 × 600 that equals 2112600
+ 3521 × 1000 which equals 3521000

= 5880070
