Tell a child right before going into class to stand up after the prayer and hand them out to each person without being prompted to.
Then, ask the students why this person stood up and performed the action of handing out the slips of paper.
Explain that he was asked to do it before class and that this is a lot like foreordination. Once in the class, he didn't have to do it. He still had his agency, but he chose to do it.
Before your students were born, "Heavenly Father had specific things for you to accomplish on earth. He foreordained you to accomplishing your own personal mission on earth as well as to any callings you receive".
Luke 1 13:-17
13 But the angel said unto him, Fear not, Zacharias: for thy prayer is heard; and thy wife Elisabeth shall bear thee a son, and thou shalt call his name John.
14 And thou shalt have joy and gladness; and many shall rejoice at his birth.
15 For he shall be great in the sight of the Lord, and shall drink neither wine nor strong drink; and he shall be filled with the Holy Ghost, even from his mother’s womb.
16 And many of the children of Israel shall he turn to the Lord their God.
17 And he shall go before him in the spirit and power of Elias, to turn the hearts of the fathers to the children, and the disobedientto the wisdom of the just; to make ready a people prepared for the Lord.
1 Peter 1 19-21
19 But with the precious blood of Christ, as of a lamb without blemish and without spot:
20 Who verily was foreordained before the foundation of the world, but was manifest in these last times for you,
21 Who by him do believe in God, that raised him up from the dead, and gave him glory; that your faith and hope might be in God.
22 Now the Lord had shown unto me, Abraham, the intelligences that were organized before the world was; and among all these there were many of the noble and great ones;
23 And God saw these souls that they were good, and he stood in the midst of them, and he said: These I will make my rulers; for he stood among those that were spirits, and he saw that they were good; and he said unto me: Abraham, thou art one of them; thou wast chosen before thou wast born.