Alright, let's work through 1046 times 7830 step by step
1046 × 7830 = 7830 × (1046)
+ 7830 × 6 producing 46980
+ 7830 × 40 giving us 313200
+ 7830 × 000 producing 0
+ 7830 × 1000 what gives us 7830000

= 8190180
