No problem, we've got 1631 and 7830 to multiply
1631 × 7830 = 7830 × (1631)
+ 7830 × 1 yielding 7830
+ 7830 × 30 giving us 234900
+ 7830 × 600 giving us 4698000
+ 7830 × 1000 which equals 7830000

= 12770730
