Alright, let's work through 1390 times 7140 step by step
1390 × 7140 = 7140 × (1390)
+ 7140 × 0 resulting in 0
+ 7140 × 90 that results in 642600
+ 7140 × 300 yielding 2142000
+ 7140 × 1000 yielding 7140000

= 9924600
