Alright, let's work through 9090 times 143 step by step
9090 × 143 = 143 × (9090)
+ 143 × 0 that equals 0
+ 143 × 90 resulting in 12870
+ 143 × 000 yielding 0
+ 143 × 9000 that equals 1287000

= 1299870
