How do you say --- this action?

Now, we are in summer vacation. Later I'll tell you how to spend this vacation.
And from next week, my daily life will have started.
Next Tuesday, it is a volunteering day at the library.
I'll read some English picture books, and about one book I'm thinking about an activity.

I prepared cups with a number.

1. please spread the cups randomly.

2.While I'm reading the book, I shout a number. So take a cup of the same number and stack the cups.

3. Thanks. Well, now I'll read the book again from backward, When I shout a number, please remove the cup with the number.

Does it make sense?
If some one  help me, I owe you one!