Alright, let's work through 85231900 times 30211231 step by step
85231900 × 30211231 = 30211231 × (85231900)
+ 30211231 × 0 producing 0
+ 30211231 × 00 resulting in 0
+ 30211231 × 900 giving us 27190107900
+ 30211231 × 1000 what gives us 30211231000
+ 30211231 × 30000 that results in 906336930000
+ 30211231 × 200000 which equals 6042246200000
+ 30211231 × 5000000 yielding 151056155000000
+ 30211231 × 80000000 what gives us 2416898480000000

= 2574960619468900
