Alright, let's work through 9997 times 5420 step by step
9997 × 5420 = 5420 × (9997)
+ 5420 × 7 resulting in 37940
+ 5420 × 90 that is equal 487800
+ 5420 × 900 giving us 4878000
+ 5420 × 9000 that equals 48780000

= 54183740
