Easily square numbers from 30 to 39.
Example
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Step 1
Square the ones place digit.
{% scaleimage l302_step1.png %}
Step 2
Multiply the ones place digit by 6.
7 * 6 = 42
Step 3
Add a zero to the end of step 2.
42 x 10 = 420
Step 4
Add the results of step 1 and step 3.
49 + 420 = 469
Step 5
Add 900 to the result of step 4.
469 + 900 = 1369
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