No problem, we've got 4900 and 4009 to multiply
4900 × 4009 = 4009 × (4900)
+ 4009 × 0 producing 0
+ 4009 × 00 what gives us 0
+ 4009 × 900 that is equal 3608100
+ 4009 × 4000 that is equal 16036000

= 19644100
