No problem, we've got 4247 and 643 to multiply
4247 × 643 = 643 × (4247)
+ 643 × 7 that results in 4501
+ 643 × 40 that results in 25720
+ 643 × 200 giving us 128600
+ 643 × 4000 resulting in 2572000

= 2730821
