Alright, let's work through 5135 times 278 step by step
5135 × 278 = 278 × (5135)
+ 278 × 5 that results in 1390
+ 278 × 30 which equals 8340
+ 278 × 100 yielding 27800
+ 278 × 5000 that results in 1390000

= 1427530
