Easily square numbers in the 50's
Example
{% scaleimage l14_example.png %}
Step 1
Add the ones digit from the number to 25
25 + 3 = 28
Step 2
Square the ones digit
{% scaleimage l10_step2.png %}
If less than 10
keep a zero in front
Step 3
Put the answer in step 2 behind the answer from step 1
{% scaleimage l14_step3.png %}