Alright, let's work through 81008531 times 98379882 step by step
81008531 × 98379882 = 98379882 × (81008531)
+ 98379882 × 1 which equals 98379882
+ 98379882 × 30 that results in 2951396460
+ 98379882 × 500 resulting in 49189941000
+ 98379882 × 8000 which equals 787039056000
+ 98379882 × 00000 that is equal 0
+ 98379882 × 000000 what gives us 0
+ 98379882 × 1000000 that is equal 98379882000000
+ 98379882 × 80000000 that equals 7870390560000000

= 7969609720773342
