Alright, let's work through 97980621 times 89905990 step by step
97980621 × 89905990 = 89905990 × (97980621)
+ 89905990 × 1 what gives us 89905990
+ 89905990 × 20 what gives us 1798119800
+ 89905990 × 600 that results in 53943594000
+ 89905990 × 0000 producing 0
+ 89905990 × 80000 resulting in 7192479200000
+ 89905990 × 900000 which equals 80915391000000
+ 89905990 × 7000000 resulting in 629341930000000
+ 89905990 × 90000000 that equals 8091539100000000

= 8809044731819790
