No problem, we've got 3400 and 6360 to multiply
3400 × 6360 = 6360 × (3400)
+ 6360 × 0 which equals 0
+ 6360 × 00 that equals 0
+ 6360 × 400 yielding 2544000
+ 6360 × 3000 resulting in 19080000

= 21624000
