We're going to solve 9000 multiplied by 9990
9000 × 9990 = 9990 × (9000)
+ 9990 × 0 what gives us 0
+ 9990 × 00 that equals 0
+ 9990 × 000 that results in 0
+ 9990 × 9000 that results in 89910000

= 89910000
