Alright, let's work through 1399 times 1352 step by step
1399 × 1352 = 1352 × (1399)
+ 1352 × 9 resulting in 12168
+ 1352 × 90 that results in 121680
+ 1352 × 300 producing 405600
+ 1352 × 1000 that is equal 1352000

= 1891448
