Tic-Tac-Toe Math For Grades 3 and 4 Author:David Clark Now there are more of these fun, reproducible problems in a tic-tac-toe game format. Perfect for warm-ups or extra credit, the problems cover money, time, estimation, fractions, decimals, geometry, statistics, probability, algebra, and more. Students practice problem-solving techniques such as guess-and check, look for a pattern, and work backwa... more »rd. Skills planner and answers are included. Grades 3-4« less