Alright, let's work through 1501 times 8439 step by step
1501 × 8439 = 8439 × (1501)
+ 8439 × 1 that results in 8439
+ 8439 × 00 resulting in 0
+ 8439 × 500 that is equal 4219500
+ 8439 × 1000 yielding 8439000

= 12666939
