Alright, let's work through 1248 times 1940 step by step
1248 × 1940 = 1940 × (1248)
+ 1940 × 8 which equals 15520
+ 1940 × 40 resulting in 77600
+ 1940 × 200 resulting in 388000
+ 1940 × 1000 producing 1940000

= 2421120
