Alright, let's work through 8670 times 312 step by step
8670 × 312 = 312 × (8670)
+ 312 × 0 that results in 0
+ 312 × 70 which equals 21840
+ 312 × 600 producing 187200
+ 312 × 8000 that results in 2496000

= 2705040
