Let's counting abacus, I'll counting 1-30, count by 1. Counting 1 2 3 … 30.
I'll counting 2-20, count by 2. Counting 2 4 6 … 20.
I'll counting 1-60, count by 5. Counting 5 10 15 … 60.
I'll counting 10-100, count by 10. Counting 10 20 30 … 100.
Let's counting 1-10 together, 1 2 3 … 10.