Multiply two numbers that differ by 2, 4 or 6 by using their average.
Example
{% scaleimage l16_example.png float_right %}
Step 1
Identify the average of the two numbers. This will be a number that sits halfway between the two numbers.
{% scaleimage l16_step1.png %}
Halfway
Step 2
Square the average found in step 1
{% scaleimage l16_step2.png %}
Step 3
If the numbers differ by:
2 then subtract 1 from step 2
4 then subtract 4 from step 2
6 then subtract 9 from step 2
{% scaleimage l16_step3.png %}