Easily square numbers from 601 to 699.
Example
{% scaleimage l311_example.png %}
Step 1
Square the last 2 digits.
{% scaleimage l311_step1.png %}
Step 2
Multiply the last two digits by 12.
05 * 12 = 60
Step 3
Add two zeros to the end of step 2.
60 x 100 = 6000
Step 4
Add the results of step 1 and step 3.
6000 + 25 = 6025
Step 5
Add 360000 to the result of step 4.
360000 + 6025 = 366025
{% scaleimage lesson_underline.png %}