Here's a great idea you can use at home to help children pray and it only costs £1!
I've always loved the idea of teaspoon prayers- 'tsp' being the abbreviation of 'teaspoon' in recipes but also being the initial letters of 'thanks, sorry and please', three things we can encourage children to pray about. I like things that stick in the head!
I got a pack of small spoons from the pound shop and wrote t or s or p on each one with a permanent marker. Then I put them in a jar. Children can take a spoon at random from the jar and then pray a 'thanks', 'sorry' or 'please' prayer according to the letter on their spoon.