Alright, let's work through 7870 times 649 step by step
7870 × 649 = 649 × (7870)
+ 649 × 0 yielding 0
+ 649 × 70 producing 45430
+ 649 × 800 that is equal 519200
+ 649 × 7000 resulting in 4543000

= 5107630
