Alright, let's work through 81109300 times 51192646 step by step
81109300 × 51192646 = 51192646 × (81109300)
+ 51192646 × 0 that equals 0
+ 51192646 × 00 what gives us 0
+ 51192646 × 300 resulting in 15357793800
+ 51192646 × 9000 producing 460733814000
+ 51192646 × 00000 that results in 0
+ 51192646 × 100000 what gives us 5119264600000
+ 51192646 × 1000000 that results in 51192646000000
+ 51192646 × 80000000 yielding 4095411680000000

= 4152199682207800
