Sing a song with your child. Clap out the rhythms. Emphasize the rhymes at the ends of the lines, should they be there. You will reinforce their ability to recognize two key kinds of sound-based patterns.
Create a pattern with your child. Make a bead necklace with the same repeating pattern of beads and encourage your child to recreate the pattern. In math class, students will often have to recognize repeating number patterns, and this activity may make it a little easier.
Point out patterns similar to the one that you created in step two. Commercially available candy necklaces may contain similar patterns. Purchase a few and engage your child in discovering the pattern, or lack thereof.
Create number-based patterns, and help your child identify them. Start with dominoes. Create a pattern where you have a domino with one dot, a domino with three dots and then a domino with five dots. Ask your child if he can identify the progression. If not, point out that the dots increase by two between dominoes. Ask him to predict the numbers of dots on subsequent dominoes.