Masterminds Riddle Math for Middle Grades: Decimals, Percentages, Metric System, and Consumer Math: Reproducible Skill Builders and Higher Order Thinking Activities Based on Nctm Standards by Brenda Opie (Paperback / softback, 1995)

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Motivate students to add and subtract decimals; solve word problems by multiplying and dividing decimals; use graphs to determine percents; change fractions to percents; multiply and divide to change metric units; and balance a budget with the challenging math riddles in this book. All of the skills are based on NCTM standards and each page is an engaging and humorous puzzle.