Quickly square numbers between 41 and 59.
Example
{% scaleimage l10_example.png %}
Step 1
Subtract 25 from the number
47 - 25 = 22
Step 2
Square the difference between the number and 50
50 - 47 = 3
{% scaleimage l10_step2.png %}
If less than 10
keep a zero in front
Step 3
Put the answers from step 1 and step 2 together
{% scaleimage l10_step3.png %}