Start in the morning with a jar of marbles for you and one with the same number of marbles for your child. Tell your child that for the rest of the day, she cannot answer "yes" or "no" to any question. Instead, she must answer "yep" or "nope." If she fails to do so, she must give you a marble. However, you must play by the same rules. Every time a marble changes hands, ask your child to do the math, using addition or subtraction. Whoever has the most marbles at the end of the day wins the game.
Ask your child to go on a geometry hunt through your house. Ask him to find examples of a circle, a square, triangle and other shapes. For example, your child might identify a clock or a ball as a circle and a picture frame as a rectangle. Have your child draw a picture of the items he selects to represent the various shapes and label them.
Have your child cut pictures out of catalogs and magazines that represent the numbers 1 through 10. Your child might cut out a picture of one person and a picture with 10 balloons. Glue the pictures onto individual sheets of paper, put the pages in order and staple the corners of the pages together to create a numbers book.
Buy a large beach ball and write the numbers 1 through 9 all over its surface with a permanent marker. Toss the ball back and forth with your child. She must correctly add the two numbers her thumbs land on, then toss the ball back to you.