Alright, let's work through 80359941 times 42353668 step by step
80359941 × 42353668 = 42353668 × (80359941)
+ 42353668 × 1 producing 42353668
+ 42353668 × 40 resulting in 1694146720
+ 42353668 × 900 resulting in 38118301200
+ 42353668 × 9000 that results in 381183012000
+ 42353668 × 50000 that results in 2117683400000
+ 42353668 × 300000 which equals 12706100400000
+ 42353668 × 0000000 resulting in 0
+ 42353668 × 80000000 giving us 3388293440000000

= 3403538261613588
