Alright, let's work through 80996670 times 70899671 step by step
80996670 × 70899671 = 70899671 × (80996670)
+ 70899671 × 0 that is equal 0
+ 70899671 × 70 resulting in 4962976970
+ 70899671 × 600 resulting in 42539802600
+ 70899671 × 6000 that results in 425398026000
+ 70899671 × 90000 resulting in 6380970390000
+ 70899671 × 900000 giving us 63809703900000
+ 70899671 × 0000000 yielding 0
+ 70899671 × 80000000 that results in 5671973680000000

= 5742637255095570
