No problem, we've got 3900 and 5521 to multiply
3900 × 5521 = 5521 × (3900)
+ 5521 × 0 that is equal 0
+ 5521 × 00 yielding 0
+ 5521 × 900 resulting in 4968900
+ 5521 × 3000 that equals 16563000

= 21531900
