Case 2 – the number of digits is less than the number of 9s.

Step 1 – Subtract 1 from the number and write it down as the first part of the answer

Step 2 – Subtract this above result from the 9s and you get the second part of the answer.

54 x 9999 =>

Step 1 = 54 -1 = 53

Step 2 = 9999 – 53 = 9946

54 x 99 = 539946