I can pray to Heavenly Father and receive answers to my prayers
(Friend Feb. 2005, suggestion # 1)

Help the children memorize the following lines from the Faith in God guidebook (inside front cover):

"I know Heavenly Father loves me, and I love Him.
I can pray to Heavenly Father anytime, anywhere. I am trying to remember and follow Jesus Christ."

Adapt a scripture story on prayer into a simple role play (see TNGC, p. 178) for example:

Let the children role-play this story, using simple costumes or name tags.

Use questions to review the story and reinforce the principle of prayer (see TNGC, pp. 68–70).

Repeat with the children the memorized lines.
Group each class of children with their teacher, and let them tell their favorite scripture stories or their own experiences about prayers being answered.

Let each class choose a child to tell their story to the whole Primary as time allows.