Alright, let's work through 1323 times 615 step by step
1323 × 615 = 615 × (1323)
+ 615 × 3 which equals 1845
+ 615 × 20 that equals 12300
+ 615 × 300 which equals 184500
+ 615 × 1000 that equals 615000

= 813645
