Alright, let's work through 15300315 times 79636678 step by step
15300315 × 79636678 = 79636678 × (15300315)
+ 79636678 × 5 producing 398183390
+ 79636678 × 10 producing 796366780
+ 79636678 × 300 that equals 23891003400
+ 79636678 × 0000 that is equal 0
+ 79636678 × 00000 that equals 0
+ 79636678 × 300000 that is equal 23891003400000
+ 79636678 × 5000000 giving us 398183390000000
+ 79636678 × 10000000 what gives us 796366780000000

= 1218466258953570
