Easily square numbers from 70 to 79.
Example
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Step 1
Square the ones place digit.
{% scaleimage l304_step1.png %}
Step 2
Multiply the ones place digit by 14.
3 x 14 = 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.
420 + 9 = 429
Step 5
Add 4900 to the result of step 4.
4900 + 429 = 5329
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