Alright, let's work through 78245031 times 42280645 step by step
78245031 × 42280645 = 42280645 × (78245031)
+ 42280645 × 1 what gives us 42280645
+ 42280645 × 30 that is equal 1268419350
+ 42280645 × 000 producing 0
+ 42280645 × 5000 yielding 211403225000
+ 42280645 × 40000 what gives us 1691225800000
+ 42280645 × 200000 that results in 8456129000000
+ 42280645 × 8000000 which equals 338245160000000
+ 42280645 × 70000000 producing 2959645150000000

= 3308250378724995
