No problem, we've got 4045 and 6310 to multiply
4045 × 6310 = 6310 × (4045)
+ 6310 × 5 that equals 31550
+ 6310 × 40 that equals 252400
+ 6310 × 000 producing 0
+ 6310 × 4000 that is equal 25240000

= 25523950
