Alright, let's work through 9954 times 7839 step by step
9954 × 7839 = 7839 × (9954)
+ 7839 × 4 that equals 31356
+ 7839 × 50 what gives us 391950
+ 7839 × 900 that equals 7055100
+ 7839 × 9000 giving us 70551000

= 78029406
