Alright, let's work through 1311 times 1284 step by step
1311 × 1284 = 1284 × (1311)
+ 1284 × 1 that equals 1284
+ 1284 × 10 yielding 12840
+ 1284 × 300 that results in 385200
+ 1284 × 1000 which equals 1284000

= 1683324
