Enhance your child's mathematical skills with the Learning Advantage Addition & Subtraction Complementary Equations Flash Cards. These flash cards feature a fact family format and are suitable for children aged 1-17 years. They are made by a reputable brand and manufactured in China. The deck of flash cards are vertical format that includes 90 cards grade level: k-8 , math facts 0-9, notched for easy sorting, bold, heavy typo for use in large groups, double, thick card stick, includes activity cards and more, self checking, double - sided with fact family format and is perfect for parents, teachers or homeschoolers who want to teach their children addition and subtraction skills in a fun and engaging way. The cards cover a wide range of age levels, ensuring that all children can benefit from them. Add this set to your child's educational toys and help them excel in mathematics.