1. Choose a number between 3000 and 3099. (Start with numbers below 3025 to begin with, then graduate to larger numbers.)
2. The first two digits are: 9 0 _ _ _ _ _
3. The next two digits are 6 times the last two digits:
   9 0 X X _ _ _
4. For the last three digits, square the last two digits in the number chosen (insert zeros when needed):
   9 0 _ _ X X X

   Example:

1. If the number to be squared is 3004:
2. The first two digits are: 9 0 _ _ _ _ _
3. The next two digits are 6 times the last two:
   6 × 4 = 24: _ _ 2 4 _ _ _
4. For the last three digits, square the last two:
   4 × 4 = 16: _ _ _ _ 0 1 6
5. So 3004 × 3004 = 9,024,016.

   See the pattern?

For larger numbers, reverse the order:
1. If the number to be squared is 3025:
2. For the last three digits, square the last two:
   25 × 25 = 625: _ _ _ _ 6 2 5
3. The middle two digits are 6 times the last two (keep the carry):
   6 × 25 = 150 (keep carry of 1): _ _ 5 0 _ _ _
4. The first two digits are 90 + the carry:
   90 + 1 = 91: 9 1 _ _ _ _ _
5. So 3025 × 3025 = 9,150,625.