15 Best Number Games And Activities For Kindergarten Kids - MomJunction Write a number, from one to 20, on each piece of paper. Do not repeat a number. Stick the papers at different places randomly, around the house. Put them in places where the child is likely to find them. Set a timer for ten minutes and ask the kid to search for all the 20 slips of paper. Each time he finds one, he reads the number on it aloud.