Number Mind Game

Rules:

1. Try to count from 20 to 1 as 20,19,18......so on up to 1 but at the same time write 1 to 20 on your notebook as 1,2,3.....up to 20.
for example:speak 20 and write 1 then speak 19 and write 2.

2. Try to speak it as fast as you can.