Alright, let's work through 90971900 times 90238408 step by step
90971900 × 90238408 = 90238408 × (90971900)
+ 90238408 × 0 producing 0
+ 90238408 × 00 producing 0
+ 90238408 × 900 what gives us 81214567200
+ 90238408 × 1000 giving us 90238408000
+ 90238408 × 70000 that is equal 6316688560000
+ 90238408 × 900000 that results in 81214567200000
+ 90238408 × 0000000 that equals 0
+ 90238408 × 90000000 yielding 8121456720000000

= 8209159428735200
