Alright, let's work through 9840 times 5261 step by step
9840 × 5261 = 5261 × (9840)
+ 5261 × 0 that results in 0
+ 5261 × 40 that results in 210440
+ 5261 × 800 what gives us 4208800
+ 5261 × 9000 producing 47349000

= 51768240
