Alright, let's work through 1215 times 836 step by step
1215 × 836 = 836 × (1215)
+ 836 × 5 what gives us 4180
+ 836 × 10 giving us 8360
+ 836 × 200 producing 167200
+ 836 × 1000 yielding 836000

= 1015740
