Talk to your child's teacher. Most teachers are willing to share what their curriculum is for the year. Ask them whether they have any spare worksheets or what they use as sources for homework problems.
Find your state's competencies online. Search for "fifth grade math competencies" (without the quotation marks) and the name of your state. Choose the department of education site for your state. Many states will have online booklets of grade-level content expectations. You can then create math problems from the competencies.
Look for workbooks and math books in your local bookstore or teacher's store. Both types of stores will often carry workbooks for specific age groups and on specific subjects. Several brands of fifth grade math books exist that are filled with practice problems. Some come with tear-out sheets and the answers in the back. It is also possible to order math textbooks designed for fifth graders.
Buy math manipulatives online or at teacher stores. Many tools are available for hands-on learners. These manipulatives help your child understand the concepts behind math problems. In fifth grade, common manipulatives include pattern blocks, fraction pieces, geometric shapes, factor trees, tessellations, color tiles and dice.
Find online websites with math problems. The Web is exploding with educational sites, many directly geared toward specific ages. Teachers will share math ideas and several sites are designed for home-schoolers to use. Some sites sell math lessons while others offer them free.
Play family games involving math. Kids might not even notice they're learning when you incorporate math lessons into family games. Classic math games include dominoes, Yahtzee, cribbage, backgammon, Parcheesi and Monopoly. Books with math-related puzzles such as Sudoku, Kakuru or logic puzzles also are available.