• LEARN MATH IN A FLASH -- This set of math flash cards includes 20 double-sided, triangular cards. Use them to help kids, aged 6+, master addition and subtraction while learning families of facts.
• BUILD EARLY MATH SKILLS -- Master basic addition and subtraction! Review addition by covering the red number. Review subtraction by covering either of the black numbers.
• TAKE THEM ANYWHERE -- These cards ensure a fun math experience anywhere. Use them in study groups, classrooms or for revision at home!
• SUITS VARIOUS SKILL LEVELS -- Each card contains easier problems on one side and more difficult problems on the other. Kids gain confidence by using the same cards as more proficient students.
• DEVELOPED BY AN EXPERT -- In the 1970s, Dr. Lola May, a renowned mathematics educator, introduced the idea of triangle flash cards. These cards follow her original idea!
• REV UP LEARNING! -- Pair these with our multiplication and division Triangle Flash Cards (sold separately) to complete the classroom or homeschool experience.

Eliminate memory overload and learn 4 math facts on each side of a card! Triangle Flash Cards teach families of facts, showing the relationship between addition and subtraction. How is 4 in one corner related to 7 and 3 in the other corners? For 2 or more players. Each card displays eight problems - four are addition and four are subtraction. Relationship between addition and subtraction facts is emphasized. Students will gain efficiency in memorizing. Cards permit individualization of drill without changing cards. A harder fact is printed on one side of a card and an easier fact is printed on the other side. Includes variations in activities. Supports state and national mathematics standards. Each set includes 20 cards and instructions.