> Choose a number over 100 (START WITH SMALLER NUMBER). > The last two places will be the square of the last two digits (keep if any carry) _ _ _ X X. > The first three places will be the number plus the last two digits plus any carry: X X X _ _.
here is an Example:
> let the number be 108: 2. Square the last two digits (no carry): 8 × 8 = 64: _ _ _ 64 3. Add the last two digits to the number: 108 + 08= 116: so 1 1 6 _ _ 4. So 108 × 108 = 11664.
