Alright, let's work through 90117145 times 42069299 step by step
90117145 × 42069299 = 42069299 × (90117145)
+ 42069299 × 5 yielding 210346495
+ 42069299 × 40 yielding 1682771960
+ 42069299 × 100 which equals 4206929900
+ 42069299 × 7000 that results in 294485093000
+ 42069299 × 10000 what gives us 420692990000
+ 42069299 × 100000 that is equal 4206929900000
+ 42069299 × 0000000 that results in 0
+ 42069299 × 90000000 that equals 3786236910000000

= 3791165118031355
