Alright, let's work through 1243 times 2400 step by step
1243 × 2400 = 2400 × (1243)
+ 2400 × 3 that is equal 7200
+ 2400 × 40 yielding 96000
+ 2400 × 200 which equals 480000
+ 2400 × 1000 giving us 2400000

= 2983200
