Pick out a recipe for a dish your child loves. Guide your child through the steps of the recipe, letting him handle the measuring duties. When you're ready to place the dish in the oven, use an analog clock to time it. Help your child figure out what time the dish should be taken out of the oven. Cooking helps children work with fractions and time, two concepts that can be difficult to grasp.
Open a savings account with your child. Give her a paper register and show her how to keep track of deposits and withdrawals, making sure she adds and subtracts correctly. Scratch paper can be helpful. As your child grows older, assist him in setting up a spreadsheet on the computer to incorporate necessary computer skills.
Sports offer an excellent avenue for learning math: statistics. If your child loves sports, watch her favorite game with her and help her keep track of and calculate statistics. If your child plays sports, help him compute his own statistics. This exercise is especially helpful with averaging and calculating percentages.
When it's time to go grocery shopping, make a list with your child. Let her know how much money you can spend. When you get to the store, help your child keep a running total of goods accumulated in your basket by rounding prices to the nearest dollar. Once you get to the check-out counter, guess how close you came to the actual total. Addition and estimation are both addressed in this activity. Consider throwing in coupons to factor in subtraction.
Make a list of geometry terms you would like your child to learn. Your list will vary by age. For instance, a second grader may have a list of two-dimensional shapes, while a fourth grader may have a list of three-dimensional shapes, lines and angles. Once you have developed a list, accompany your child around the house and find examples of each term. For example, a cereal box makes a great rectangular prism, the corner of a table is a right angle, and the top of a bowl makes a perfect circle.