Boost your seventh-grader’s retention of important mathematics skills and concepts with Abeka’s Intermediate Math Concept Cards. Included in this set are 199 colorful cards covering important concepts such as decimals, ratios, symbols, time measures, formulas, fractions, and metric prefixes. For ease of use, these cards are color coded by quarter and tabbed by chapter, making them the ideal study tool to enhance comprehension and review. 199 cards. Grade 7.