Incrementation by Four
Just count the numbers on the cycle in both the even cycle (0-4-8-2-6...) and in the odd cycle (1-5-9-3-7...). Know this by heart before you do step 2.
Do first as beginner, then migrate to slow, then medium, and then fast. Keep up in counting along with the graphic progression.
Remember, a 0 means any number that ends in a zero, like 10, or 40 , or 2430. Do both the EVEN and ODD incrementations.